--- a/PLCControler.py	Fri Sep 27 09:32:39 2013 +0900
+++ b/PLCControler.py	Sat Sep 28 15:59:50 2013 +0900
@@ -844,8 +844,10 @@
         Adds the POU defined by 'pou_xml' to the current project with type 'pou_type'
         '''
         try:
-            new_pou = LoadPou(pou_xml)
+            new_pou, error = LoadPou(pou_xml)
         except:
+            error = ""
+        if error is not None:
             return _("Couldn't paste non-POU object.")
         
         name = new_pou.getname()
@@ -2207,10 +2209,10 @@
             new_id = {}
             
             try:
-                instances = LoadPouInstances(text.encode("utf-8"), bodytype)
-                if len(instances) == 0:
-                    raise ValueError
+                instances, error = LoadPouInstances(text.encode("utf-8"), bodytype)
             except:
+                instances, error = [], ""
+            if error is not None or len(instances) == 0:
                 return _("Invalid plcopen element(s)!!!")
             
             exclude = {}
@@ -2285,24 +2287,25 @@
                 instance.translate(*diff)
             
             return new_id, connections
-                
+    
+    # Return the current pou editing instances idx
+    def GetEditedElementInstancesIds(self, tagname, debug = False):
+        element = self.GetEditedElement(tagname, debug)
+        if element is not None:
+            return element.getinstancesIds()
+        return []
+    
     # Return the current pou editing informations
-    def GetEditedElementInstanceInfos(self, tagname, id = None, exclude = [], debug = False):
-        infos = {}
-        instance = None
+    def GetEditedElementInstanceInfos(self, tagname, id, debug = False):
         element = self.GetEditedElement(tagname, debug)
         if element is not None:
-            # if id is defined
-            if id is not None:
-                instance = element.getinstance(id)
-            else:
-                instance = element.getrandomInstance(exclude)
-        if instance is not None:
-            infos = instance.getinfos()
-            if infos["type"] in ["input", "output", "inout"]:
-                var_type = self.GetEditedElementVarValueType(tagname, infos["specific_values"]["name"], debug)
-                infos["specific_values"]["value_type"] = var_type
-            return infos
+            instance = element.getinstance(id)
+            if instance is not None:
+                infos = instance.getinfos()
+                if infos["type"] in ["input", "output", "inout"]:
+                    var_type = self.GetEditedElementVarValueType(tagname, infos["specific_values"]["name"], debug)
+                    infos["specific_values"]["value_type"] = var_type
+                return infos
         return None
     
     def ClearEditedElementExecutionOrder(self, tagname):
@@ -3063,10 +3066,9 @@
             return tasks_data, instances_data
 
     def OpenXMLFile(self, filepath):
-        #try:
-        self.Project = LoadProject(filepath)
-        #except Exception, e:
-        #    return _("Project file syntax error:\n\n") + str(e)
+        self.Project, error = LoadProject(filepath)
+        if self.Project is None:
+            return _("Project file syntax error:\n\n") + error
         self.SetFilePath(filepath)
         self.CreateProjectBuffer(True)
         self.ProgramChunks = []
@@ -3075,7 +3077,7 @@
         self.CurrentCompiledProject = None
         self.Buffering = False
         self.CurrentElementEditing = None
-        return None
+        return error
         
     def SaveXMLFile(self, filepath = None):
         if not filepath and self.FilePath == "":