diff --git a/htdocs/compta/bank/class/account.class.php b/htdocs/compta/bank/class/account.class.php
index 247cecb2eea..205b59bedf2 100644
--- a/htdocs/compta/bank/class/account.class.php
+++ b/htdocs/compta/bank/class/account.class.php
@@ -1633,7 +1633,11 @@ class Account extends CommonObject
  */
 class AccountLine extends CommonObject
 {
-	var $error;
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
 	var $db;
 	var $element='bank';
 	var $table_element='bank';
diff --git a/htdocs/compta/facture/class/paymentterm.class.php b/htdocs/compta/facture/class/paymentterm.class.php
index 61d477522dc..763c4705db5 100644
--- a/htdocs/compta/facture/class/paymentterm.class.php
+++ b/htdocs/compta/facture/class/paymentterm.class.php
@@ -29,7 +29,11 @@
 class PaymentTerm // extends CommonObject
 {
 	var $db;							//!< To store db handler
-	var $error;							//!< To return error code (or message)
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/contact/canvas/actions_contactcard_common.class.php b/htdocs/contact/canvas/actions_contactcard_common.class.php
index 921c9e60580..7398b427055 100644
--- a/htdocs/contact/canvas/actions_contactcard_common.class.php
+++ b/htdocs/contact/canvas/actions_contactcard_common.class.php
@@ -37,8 +37,11 @@ abstract class ActionsContactCardCommon
 	var $tpl = array();
 	//! Object container
 	var $object;
-	//! Error string
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 	
 
 	/**
diff --git a/htdocs/core/class/antivir.class.php b/htdocs/core/class/antivir.class.php
index a530da66e3d..e82b97c73ba 100644
--- a/htdocs/core/class/antivir.class.php
+++ b/htdocs/core/class/antivir.class.php
@@ -30,7 +30,10 @@
  */
 class AntiVir
 {
-	var $error;
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/canvas.class.php b/htdocs/core/class/canvas.class.php
index 3fed7cb722e..1a5573a7279 100644
--- a/htdocs/core/class/canvas.class.php
+++ b/htdocs/core/class/canvas.class.php
@@ -29,7 +29,11 @@
 class Canvas
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/ccountry.class.php b/htdocs/core/class/ccountry.class.php
index 43d63ebb1d9..be5a7f2e490 100644
--- a/htdocs/core/class/ccountry.class.php
+++ b/htdocs/core/class/ccountry.class.php
@@ -33,7 +33,11 @@
 class Ccountry // extends CommonObject
 {
 	var $db;							//!< To store db handler
-	var $error;							//!< To return error code (or message)
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/cstate.class.php b/htdocs/core/class/cstate.class.php
index 7a853cdf18a..e94d00bcb07 100644
--- a/htdocs/core/class/cstate.class.php
+++ b/htdocs/core/class/cstate.class.php
@@ -33,7 +33,11 @@
 class Cstate // extends CommonObject
 {
 	var $db;							//!< To store db handler
-	var $error;							//!< To return error code (or message)
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/ctypent.class.php b/htdocs/core/class/ctypent.class.php
index c69b70c7c35..35643a0733b 100644
--- a/htdocs/core/class/ctypent.class.php
+++ b/htdocs/core/class/ctypent.class.php
@@ -28,7 +28,11 @@
 class Ctypent // extends CommonObject
 {
 	var $db;							//!< To store db handler
-	var $error;							//!< To return error code (or message)
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/dolgraph.class.php b/htdocs/core/class/dolgraph.class.php
index f40d30f389e..444f9b3ea53 100644
--- a/htdocs/core/class/dolgraph.class.php
+++ b/htdocs/core/class/dolgraph.class.php
@@ -69,7 +69,11 @@ class DolGraph
 	var $showpercent=0;
 	var $combine=0;				// 0.05 if you want to combine records < 5% into "other"
 	var $graph;     			// Objet Graph (Artichow, Phplot...)
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	var $bordercolor;			// array(R,G,B)
 	var $bgcolor;				// array(R,G,B)
diff --git a/htdocs/core/class/dolreceiptprinter.class.php b/htdocs/core/class/dolreceiptprinter.class.php
index fbf05c99358..8aacdba4a6b 100644
--- a/htdocs/core/class/dolreceiptprinter.class.php
+++ b/htdocs/core/class/dolreceiptprinter.class.php
@@ -109,7 +109,11 @@ class dolReceiptPrinter extends Escpos
     var $tags;
     var $printer;
     var $template;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
     /**
 	 *
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/events.class.php b/htdocs/core/class/events.class.php
index abdbb1689f8..e11830aca12 100644
--- a/htdocs/core/class/events.class.php
+++ b/htdocs/core/class/events.class.php
@@ -40,7 +40,10 @@ class Events // extends CommonObject
 	var $id;
 	var $db;
 
-	var $error;
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	var $tms;
 	var $type;
diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 62122ed636c..44b38afc351 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -88,7 +88,11 @@ class ExtraFields
 	// New array to store extrafields definition
 	var $attributes;
 
-	var $error;
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
 	var $errno;
 
 
diff --git a/htdocs/core/class/google.class.php b/htdocs/core/class/google.class.php
index e923ec12252..1e2e2438114 100644
--- a/htdocs/core/class/google.class.php
+++ b/htdocs/core/class/google.class.php
@@ -27,7 +27,11 @@
 class GoogleAPI
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	var $key;
 
diff --git a/htdocs/core/class/hookmanager.class.php b/htdocs/core/class/hookmanager.class.php
index 2ba7f966712..8d37d7b5c9b 100644
--- a/htdocs/core/class/hookmanager.class.php
+++ b/htdocs/core/class/hookmanager.class.php
@@ -30,7 +30,11 @@
 class HookManager
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 6fe2dffd3d3..77d55794a3c 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -48,7 +48,12 @@
 class Form
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
 	var $num;
 
 	// Cache arrays
diff --git a/htdocs/core/class/html.formaccounting.class.php b/htdocs/core/class/html.formaccounting.class.php
index b6030809d6f..a2e1dcc9ad9 100644
--- a/htdocs/core/class/html.formaccounting.class.php
+++ b/htdocs/core/class/html.formaccounting.class.php
@@ -36,7 +36,11 @@ class FormAccounting extends Form
 	private $options_cache = array();
 
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	* Constructor
diff --git a/htdocs/core/class/html.formactions.class.php b/htdocs/core/class/html.formactions.class.php
index 451ee0d700d..01316d9b452 100644
--- a/htdocs/core/class/html.formactions.class.php
+++ b/htdocs/core/class/html.formactions.class.php
@@ -30,7 +30,11 @@
 class FormActions
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/class/html.formadmin.class.php b/htdocs/core/class/html.formadmin.class.php
index fd0470c63f4..1b6266fb6e3 100644
--- a/htdocs/core/class/html.formadmin.class.php
+++ b/htdocs/core/class/html.formadmin.class.php
@@ -30,7 +30,11 @@
 class FormAdmin
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
 	/**
diff --git a/htdocs/core/class/html.formbank.class.php b/htdocs/core/class/html.formbank.class.php
index 4ee00555b85..36eeaaacdf0 100644
--- a/htdocs/core/class/html.formbank.class.php
+++ b/htdocs/core/class/html.formbank.class.php
@@ -30,7 +30,11 @@
 class FormBank
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/class/html.formbarcode.class.php b/htdocs/core/class/html.formbarcode.class.php
index dba8c5d24e5..3d8f40bb2e8 100644
--- a/htdocs/core/class/html.formbarcode.class.php
+++ b/htdocs/core/class/html.formbarcode.class.php
@@ -29,7 +29,11 @@
 class FormBarCode
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/class/html.formcompany.class.php b/htdocs/core/class/html.formcompany.class.php
index f04cfad54bc..c03764c2f34 100644
--- a/htdocs/core/class/html.formcompany.class.php
+++ b/htdocs/core/class/html.formcompany.class.php
@@ -32,7 +32,11 @@
 class FormCompany
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
 
diff --git a/htdocs/core/class/html.formcontract.class.php b/htdocs/core/class/html.formcontract.class.php
index a3a3696e5f4..b011d7e1b14 100644
--- a/htdocs/core/class/html.formcontract.class.php
+++ b/htdocs/core/class/html.formcontract.class.php
@@ -28,7 +28,11 @@
 class FormContract
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/class/html.formcron.class.php b/htdocs/core/class/html.formcron.class.php
index 255868f02a5..99ca3924c3c 100644
--- a/htdocs/core/class/html.formcron.class.php
+++ b/htdocs/core/class/html.formcron.class.php
@@ -29,7 +29,11 @@
 class FormCron extends Form
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 *	Constructor
diff --git a/htdocs/core/class/html.formintervention.class.php b/htdocs/core/class/html.formintervention.class.php
index b675ba6e674..4a65fc7eac1 100644
--- a/htdocs/core/class/html.formintervention.class.php
+++ b/htdocs/core/class/html.formintervention.class.php
@@ -28,7 +28,11 @@
 class FormIntervention
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/class/html.formmail.class.php b/htdocs/core/class/html.formmail.class.php
index 4ce4bfee824..fd8940674e2 100644
--- a/htdocs/core/class/html.formmail.class.php
+++ b/htdocs/core/class/html.formmail.class.php
@@ -85,7 +85,10 @@ class FormMail extends Form
 	public $withtouser=array();
 	public $withtoccuser=array();
 
-	var $error;
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	public $lines_model;
 
diff --git a/htdocs/core/class/html.formmargin.class.php b/htdocs/core/class/html.formmargin.class.php
index da8acce83d4..ee88110038b 100644
--- a/htdocs/core/class/html.formmargin.class.php
+++ b/htdocs/core/class/html.formmargin.class.php
@@ -29,7 +29,11 @@
 class FormMargin
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/class/html.formprojet.class.php b/htdocs/core/class/html.formprojet.class.php
index dcc282794b9..e7b91e8c82d 100644
--- a/htdocs/core/class/html.formprojet.class.php
+++ b/htdocs/core/class/html.formprojet.class.php
@@ -30,7 +30,11 @@
 class FormProjets
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
 	/**
diff --git a/htdocs/core/class/html.formpropal.class.php b/htdocs/core/class/html.formpropal.class.php
index 14e1a466275..1f4d94f649a 100644
--- a/htdocs/core/class/html.formpropal.class.php
+++ b/htdocs/core/class/html.formpropal.class.php
@@ -28,7 +28,11 @@
 class FormPropal
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
 	/**
diff --git a/htdocs/core/class/html.formsms.class.php b/htdocs/core/class/html.formsms.class.php
index 6db6f200136..850704fe42e 100644
--- a/htdocs/core/class/html.formsms.class.php
+++ b/htdocs/core/class/html.formsms.class.php
@@ -56,7 +56,10 @@ class FormSms
     var $substit=array();
     var $param=array();
 
-    var $error;
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/class/html.formsocialcontrib.class.php b/htdocs/core/class/html.formsocialcontrib.class.php
index 83886e63af8..636cf489d7d 100644
--- a/htdocs/core/class/html.formsocialcontrib.class.php
+++ b/htdocs/core/class/html.formsocialcontrib.class.php
@@ -28,7 +28,11 @@
 class FormSocialContrib
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
 	/**
diff --git a/htdocs/core/class/ldap.class.php b/htdocs/core/class/ldap.class.php
index cd1f4a64c17..71635a89233 100644
--- a/htdocs/core/class/ldap.class.php
+++ b/htdocs/core/class/ldap.class.php
@@ -29,7 +29,10 @@
  */
 class Ldap
 {
-	var $error;
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * Tableau des serveurs (IP addresses ou nom d'hotes)
diff --git a/htdocs/core/class/notify.class.php b/htdocs/core/class/notify.class.php
index f3beece9794..22a22008d74 100644
--- a/htdocs/core/class/notify.class.php
+++ b/htdocs/core/class/notify.class.php
@@ -32,7 +32,11 @@ class Notify
 {
 	var $id;
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/core/class/rssparser.class.php b/htdocs/core/class/rssparser.class.php
index 32a5842d410..d2ce6d6d5c2 100644
--- a/htdocs/core/class/rssparser.class.php
+++ b/htdocs/core/class/rssparser.class.php
@@ -27,7 +27,11 @@
 class RssParser
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
     private $_format='';
     private $_urlRSS;
diff --git a/htdocs/core/modules/mailings/modules_mailings.php b/htdocs/core/modules/mailings/modules_mailings.php
index 1a97f3502b7..d3ea299a86e 100644
--- a/htdocs/core/modules/mailings/modules_mailings.php
+++ b/htdocs/core/modules/mailings/modules_mailings.php
@@ -32,7 +32,12 @@ require_once DOL_DOCUMENT_ROOT.'/core/lib/functions.lib.php';
 class MailingTargets    // This can't be abstract as it is used for some method
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
     var $tooltip='';
     
 
diff --git a/htdocs/core/modules/printing/modules_printing.php b/htdocs/core/modules/printing/modules_printing.php
index 4a6560b47fa..f0d96c8aea7 100644
--- a/htdocs/core/modules/printing/modules_printing.php
+++ b/htdocs/core/modules/printing/modules_printing.php
@@ -32,7 +32,11 @@ require_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
 class PrintingDriver
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
     /**
diff --git a/htdocs/core/modules/printing/printgcp.modules.php b/htdocs/core/modules/printing/printgcp.modules.php
index 8e4eafeb7b8..8e868c19a1c 100644
--- a/htdocs/core/modules/printing/printgcp.modules.php
+++ b/htdocs/core/modules/printing/printgcp.modules.php
@@ -42,12 +42,16 @@ class printing_printgcp extends PrintingDriver
     var $conf = array();
     var $google_id = '';
     var $google_secret = '';
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
     /**
-	 *
 	 * @var string[] Error codes (or messages)
 	 */
-	public $errors = array ();
+	public $errors = array();
 	
     var $db;
 
diff --git a/htdocs/core/modules/printing/printipp.modules.php b/htdocs/core/modules/printing/printipp.modules.php
index 168c411ec29..e2354870cf9 100644
--- a/htdocs/core/modules/printing/printipp.modules.php
+++ b/htdocs/core/modules/printing/printipp.modules.php
@@ -40,12 +40,16 @@ class printing_printipp extends PrintingDriver
     var $userid;    /* user login */
     var $user;
     var $password;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
     /**
-	 *
 	 * @var string[] Error codes (or messages)
 	 */
-	public $errors = array ();
+	public $errors = array();
 	
     var $db;
 
diff --git a/htdocs/ecm/class/htmlecm.form.class.php b/htdocs/ecm/class/htmlecm.form.class.php
index 3139c5f9986..db3355bce2b 100644
--- a/htdocs/ecm/class/htmlecm.form.class.php
+++ b/htdocs/ecm/class/htmlecm.form.class.php
@@ -28,7 +28,11 @@ require_once DOL_DOCUMENT_ROOT.'/ecm/class/ecmdirectory.class.php';
 class FormEcm
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
 	/**
diff --git a/htdocs/expensereport/class/expensereport.class.php b/htdocs/expensereport/class/expensereport.class.php
index 19417d6e552..6271ef7ffdb 100644
--- a/htdocs/expensereport/class/expensereport.class.php
+++ b/htdocs/expensereport/class/expensereport.class.php
@@ -2379,7 +2379,11 @@ class ExpenseReport extends CommonObject
 class ExpenseReportLine
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
     var $rowid;
     var $comments;
diff --git a/htdocs/fichinter/class/fichinter.class.php b/htdocs/fichinter/class/fichinter.class.php
index 789a351c776..d7c2d871824 100644
--- a/htdocs/fichinter/class/fichinter.class.php
+++ b/htdocs/fichinter/class/fichinter.class.php
@@ -1310,7 +1310,11 @@ class Fichinter extends CommonObject
 class FichinterLigne extends CommonObjectLine
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	// From llx_fichinterdet
 	var $fk_fichinter;
diff --git a/htdocs/fourn/class/fournisseur.product.class.php b/htdocs/fourn/class/fournisseur.product.class.php
index e7b3a292df1..4180ecaf3d0 100644
--- a/htdocs/fourn/class/fournisseur.product.class.php
+++ b/htdocs/fourn/class/fournisseur.product.class.php
@@ -38,7 +38,11 @@ require_once DOL_DOCUMENT_ROOT.'/product/dynamic_price/class/price_parser.class.
 class ProductFournisseur extends Product
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
     var $product_fourn_price_id;  // id of ligne product-supplier
 
diff --git a/htdocs/imports/class/import.class.php b/htdocs/imports/class/import.class.php
index 875efc27410..ae7cc240695 100644
--- a/htdocs/imports/class/import.class.php
+++ b/htdocs/imports/class/import.class.php
@@ -43,7 +43,10 @@ class Import
 	var $array_import_convertvalue;
 	var $array_import_run_sql_after;
 
-	var $error;
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/mailmanspip/class/mailmanspip.class.php b/htdocs/mailmanspip/class/mailmanspip.class.php
index f7ae2608da5..1630e61ce33 100644
--- a/htdocs/mailmanspip/class/mailmanspip.class.php
+++ b/htdocs/mailmanspip/class/mailmanspip.class.php
@@ -39,7 +39,11 @@ require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
 class MailmanSpip
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
     var $mladded_ok;
     var $mladded_ko;
diff --git a/htdocs/product/class/html.formproduct.class.php b/htdocs/product/class/html.formproduct.class.php
index b34f4a88b2d..53368c0a114 100644
--- a/htdocs/product/class/html.formproduct.class.php
+++ b/htdocs/product/class/html.formproduct.class.php
@@ -30,7 +30,11 @@ require_once DOL_DOCUMENT_ROOT.'/product/stock/class/entrepot.class.php';
 class FormProduct
 {
 	var $db;
-	var $error;
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	// Cache arrays
 	var $cache_warehouses=array();
diff --git a/htdocs/product/dynamic_price/class/price_expression.class.php b/htdocs/product/dynamic_price/class/price_expression.class.php
index 039f74302e8..958647da0a6 100644
--- a/htdocs/product/dynamic_price/class/price_expression.class.php
+++ b/htdocs/product/dynamic_price/class/price_expression.class.php
@@ -30,7 +30,11 @@
 class PriceExpression
 {
 	var $db;							//!< To store db handler
-	var $error;							//!< To return error code (or message)
+	
+	/**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 	/**
 	 * @var string[] Error codes (or messages)
diff --git a/htdocs/product/dynamic_price/class/price_global_variable.class.php b/htdocs/product/dynamic_price/class/price_global_variable.class.php
index 1432afcfdeb..f09fbd2643f 100644
--- a/htdocs/product/dynamic_price/class/price_global_variable.class.php
+++ b/htdocs/product/dynamic_price/class/price_global_variable.class.php
@@ -30,12 +30,16 @@
 class PriceGlobalVariable
 {
     var $db;							//!< To store db handler
-    var $error;							//!< To return error code (or message)
+   
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
     /**
-	 *
 	 * @var string[] Error codes (or messages)
 	 */
-	public $errors = array ();
+	public $errors = array();
 	
     var $id;
     var $code;
diff --git a/htdocs/product/dynamic_price/class/price_global_variable_updater.class.php b/htdocs/product/dynamic_price/class/price_global_variable_updater.class.php
index 37a3e116683..1cd6318494b 100644
--- a/htdocs/product/dynamic_price/class/price_global_variable_updater.class.php
+++ b/htdocs/product/dynamic_price/class/price_global_variable_updater.class.php
@@ -30,12 +30,16 @@
 class PriceGlobalVariableUpdater
 {
     var $db;							//!< To store db handler
-    var $error;							//!< To return error code (or message)
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
+	
     /**
-	 *
 	 * @var string[] Error codes (or messages)
 	 */
-	public $errors = array ();
+	public $errors = array();
 	
     var $types=array(0, 1);				//!< Updater types
     var $update_min = 5;				//!< Minimal update rate
diff --git a/htdocs/resource/class/html.formresource.class.php b/htdocs/resource/class/html.formresource.class.php
index ed667fad8ab..8a6f9d96c28 100644
--- a/htdocs/resource/class/html.formresource.class.php
+++ b/htdocs/resource/class/html.formresource.class.php
@@ -38,7 +38,10 @@ class FormResource
     var $substit=array();
     var $param=array();
 
-    var $error;
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
 
 	/**
diff --git a/htdocs/supplier_proposal/class/supplier_proposal.class.php b/htdocs/supplier_proposal/class/supplier_proposal.class.php
index 16727a781fc..1ffe4465d86 100644
--- a/htdocs/supplier_proposal/class/supplier_proposal.class.php
+++ b/htdocs/supplier_proposal/class/supplier_proposal.class.php
@@ -2637,7 +2637,11 @@ class SupplierProposal extends CommonObject
 class SupplierProposalLine extends CommonObjectLine
 {
     var $db;
-    var $error;
+    
+    /**
+	 * @var string Error code (or message)
+	 */
+	public $error='';
 
     public $element='supplier_proposaldet';
     public $table_element='supplier_proposaldet';