--- a/PLCControler.py	Tue Feb 26 15:15:27 2008 +0100
+++ b/PLCControler.py	Tue Feb 26 15:16:30 2008 +0100
@@ -414,10 +414,10 @@
                 programfile.write(program)
                 programfile.close()
                 self.ProgramFilePath = filepath
-                return True
-            except:
-                pass
-        return False
+                return None
+            except PLCGenException, e:
+                return e.message
+        return "No project opened"
 
 #-------------------------------------------------------------------------------
 #                        Project Pous management functions

--- a/PLCGenerator.py	Tue Feb 26 15:15:27 2008 +0100
+++ b/PLCGenerator.py	Tue Feb 26 15:16:30 2008 +0100
@@ -37,6 +37,9 @@
 datatypeComputed = {}
 pouComputed = {}
 
+class PLCGenException(Exception):
+    pass
+
 def ReIndentText(text, nb_spaces):
     compute = ""
     lines = text.splitlines()
@@ -114,7 +117,7 @@
         if pou_type in pouTypeNames:
             pou_program = PouProgram(pou.getname(), pouTypeNames[pou_type])
         else:
-            raise ValueError, "Undefined pou type"
+            raise PLCGenException, "Undefined pou type"
         pou_program.GenerateInterface(pou.getinterface())
         pou_program.GenerateConnectionTypes(pou)
         pou_program.GenerateProgram(pou)
@@ -538,7 +541,7 @@
                             expression = self.ComputeFBDExpression(body, connections[0], order)
                             self.ComputedConnectors[name] = expression
                             return expression
-            raise ValueError, "No connector found"
+            raise PLCGenException, "No connector found"
 
     def GenerateLDPaths(self, connections, body):
         paths = []

--- a/PLCOpenEditor.py	Tue Feb 26 15:15:27 2008 +0100
+++ b/PLCOpenEditor.py	Tue Feb 26 15:16:30 2008 +0100
@@ -703,8 +703,8 @@
             filepath = dialog.GetPath()
             if os.path.isdir(os.path.dirname(filepath)):
                 result = self.Controler.GenerateProgram(filepath)
-                if not result:
-                    message = wx.MessageDialog(self, "Can't generate program to file %s!"%filepath, "Error", wx.OK|wx.ICON_ERROR)
+                if result is not None:
+                    message = wx.MessageDialog(self, "Can't generate program to file %s :\n%s"%(filepath, result), "Error", wx.OK|wx.ICON_ERROR)
                     message.ShowModal()
                     message.Destroy()
                 else: