--- a/PLCControler.py	Wed Dec 16 15:20:56 2009 +0100
+++ b/PLCControler.py	Tue Jun 01 12:41:14 2010 +0200
@@ -2562,7 +2562,10 @@
         self.Project = plcopen.project()
         for child in tree.childNodes:
             if child.nodeType == tree.ELEMENT_NODE and child.nodeName == "project":
-                self.Project.loadXMLTree(child, ["xmlns", "xmlns:xhtml", "xmlns:xsi", "xsi:schemaLocation"])
+                try:
+                    result = self.Project.loadXMLTree(child, ["xmlns", "xmlns:xhtml", "xmlns:xsi", "xsi:schemaLocation"])
+                except ValueError, e:
+                    return _("Project file syntax error:\n\n") + str(e)
                 self.SetFilePath(filepath)
                 self.Project.RefreshElementUsingTree()
                 self.Project.RefreshDataTypeHierarchy()

--- a/PLCGenerator.py	Wed Dec 16 15:20:56 2009 +0100
+++ b/PLCGenerator.py	Tue Jun 01 12:41:14 2010 +0200
@@ -926,6 +926,8 @@
         elif type(paths) == ListType:
             vars = [self.ComputePaths(path) for path in paths]
             return JoinList([(" AND ", ())], vars)
+        elif paths is None:
+            return [("TRUE", ())]
         else:
             return eval(paths)
 
@@ -990,7 +992,7 @@
         instances = []
         for connectionPointIn in convergence.getconnectionPointIn():
             connections = connectionPointIn.getconnections()
-            if len(connections) == 1:
+            if connections is not None and len(connections) == 1:
                 instanceLocalId = connections[0].getrefLocalId()
                 body = pou.getbody()
                 if isinstance(body, ListType):
@@ -1010,7 +1012,7 @@
             if step.connectionPointIn:
                 instances = []
                 connections = step.connectionPointIn.getconnections()
-                if len(connections) == 1:
+                if connections is not None and len(connections) == 1:
                     instanceLocalId = connections[0].getrefLocalId()
                     body = pou.getbody()
                     if isinstance(body, ListType):
@@ -1039,7 +1041,7 @@
         if jump.connectionPointIn:
             instances = []
             connections = jump.connectionPointIn.getconnections()
-            if len(connections) == 1:
+            if connections is not None and len(connections) == 1:
                 instanceLocalId = connections[0].getrefLocalId()
                 body = pou.getbody()
                 if isinstance(body, ListType):

--- a/PLCOpenEditor.py	Wed Dec 16 15:20:56 2009 +0100
+++ b/PLCOpenEditor.py	Tue Jun 01 12:41:14 2010 +0200
@@ -2504,12 +2504,15 @@
     def __init__(self, parent, fileOpen = None):
         IDEFrame.__init__(self, parent)
         
+        result = None
+        
         # Open the filepath if defined
         if fileOpen is not None and os.path.isfile(fileOpen):
             # Create a new controller
             self.Controler = PLCControler()
-            self.Controler.OpenXMLFile(fileOpen)
-            self._Refresh(TYPESTREE, INSTANCESTREE, LIBRARYTREE)
+            result = self.Controler.OpenXMLFile(fileOpen)
+            if result is None:
+                self._Refresh(TYPESTREE, INSTANCESTREE, LIBRARYTREE)
         
         # Define PLCOpenEditor icon
         self.SetIcon(wx.Icon(os.path.join(CWD,"Images", "poe.ico"),wx.BITMAP_TYPE_ICO))
@@ -2517,6 +2520,9 @@
         self.Bind(wx.EVT_CLOSE, self.OnCloseFrame)
         
         self._Refresh(TITLE, TOOLBAR, FILEMENU, EDITMENU, DISPLAYMENU)
+        
+        if result is not None:
+            self.ShowErrorMessage(result)
 
     def OnCloseFrame(self, event):
         if self.Controler is None or self.CheckSaveBeforeClosing(_("Close Application")):
@@ -2595,16 +2601,23 @@
             directory = os.path.dirname(filepath)
         else:
             directory = os.getcwd()
+        
+        result = None
+        
         dialog = wx.FileDialog(self, _("Choose a file"), directory, "",  _("PLCOpen files (*.xml)|*.xml|All files|*.*"), wx.OPEN)
         if dialog.ShowModal() == wx.ID_OK:
             filepath = dialog.GetPath()
             if os.path.isfile(filepath):
                 self.ResetView()
                 self.Controler = PLCControler()
-                self.Controler.OpenXMLFile(filepath)
-                self._Refresh(TYPESTREE, INSTANCESTREE, LIBRARYTREE)
+                result = self.Controler.OpenXMLFile(filepath)
+                if result is None:
+                    self._Refresh(TYPESTREE, INSTANCESTREE, LIBRARYTREE)
             self._Refresh(TITLE, TOOLBAR, FILEMENU, EDITMENU)
         dialog.Destroy()
+        
+        if result is not None:
+            self.ShowErrorMessage(result)
     
     def OnCloseProjectMenu(self, event):
         if not self.CheckSaveBeforeClosing():