diff --git a/include/errors/class_FusionDirectoryError.inc b/include/errors/class_FusionDirectoryError.inc
index 661e67b1d8f8bd8da328edd3be0c9c84991e921e..418c3164b05d7a2161f2dc0a4fa08c0ac35ba96c 100644
--- a/include/errors/class_FusionDirectoryError.inc
+++ b/include/errors/class_FusionDirectoryError.inc
@@ -45,6 +45,11 @@ class FusionDirectoryError extends Error
     ];
   }
 
+  public function __toString ()
+  {
+    return $this->getMessage();
+  }
+
   public function computeMsgDialogParameters (): array
   {
     return [_('Error'), $this->htmlMessage, ERROR_DIALOG, static::formatTrace($this)];
diff --git a/include/errors/class_SimplePluginError.inc b/include/errors/class_SimplePluginError.inc
index 397077e3fba770a1d35421718ef4104a73e60c07..22b2f2cecf993b89cc459c29f19cb0b4f9ec7b8a 100644
--- a/include/errors/class_SimplePluginError.inc
+++ b/include/errors/class_SimplePluginError.inc
@@ -76,6 +76,30 @@ class SimplePluginError extends FusionDirectoryError
     return $array;
   }
 
+  public function __toString ()
+  {
+    $msg = '';
+
+    if (isset($this->object)) {
+      $msg .= $this->object->getBaseObject()->dn.' > ';
+    }
+
+    if (isset($this->tab) && isset($this->tab->parent->by_name[get_class($this->tab)])) {
+      $msg .= $this->tab->parent->by_name[get_class($this->tab)].' > ';
+    }
+
+    if (isset($this->attribute)) {
+      $label = $this->attribute->getLabel();
+      if (empty($label)) {
+        $msg .= $this->attribute->getLdapName();
+      } else {
+        $msg .= $label;
+      }
+    }
+
+    return $msg.': '.$this->getMessage();
+  }
+
   public function computeMsgDialogParameters (): array
   {
     $html = '';
diff --git a/include/simpleplugin/interface_SimpleTab.inc b/include/simpleplugin/interface_SimpleTab.inc
index aab62ef2112ad0093e033a61cd774f4a6bbd6abb..d8428e6d8d6abb82847cc5849d57eba6f97a46f1 100644
--- a/include/simpleplugin/interface_SimpleTab.inc
+++ b/include/simpleplugin/interface_SimpleTab.inc
@@ -135,6 +135,8 @@ interface SimpleTab
 
   /*!
    * \brief Deserialize values
+   *
+   * Returns TRUE or error
    */
   public function deserializeValues (array $values, bool $checkAcl = TRUE);