Problem with intellisense

        private void code_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Modifiers == Keys.Control && e.KeyCode == Keys.Space)
            {
                IntelliPromptMemberList memberList = code.IntelliPrompt.MemberList;
                memberList.Clear();

                memberList.AllowedCharacters.Add(new CharInterval(' '));

                foreach (LexicalPatternGroup lp in code.Document.Language.LexicalStates[0].LexicalPatternGroups)
                {
                    if ("ReservedWordToken" == lp.TokenKey)
                    {
                        foreach (LexicalPattern p in lp)
                        {
                            IntelliPromptMemberListItem mi = new IntelliPromptMemberListItem();
                            mi.Text = p.Pattern.Replace("\\s+", " ");
                            if (code.Document.Language.Properties[mi.Text] != null)
                                mi.Description = code.Document.Language.Properties[mi.Text].Value;
                            memberList.Add(mi);
                        }
                    }
                }
                memberList.Sorted = true;
                memberList.Show();
            }
        }

A first chance exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll
at System.Globalization.CompareInfo.Compare(String string1, Int32 offset1, Int32 length1, String string2, Int32 offset2, Int32 length2, CompareOptions options)
   at System.String.Compare(String strA, Int32 indexA, String strB, Int32 indexB, Int32 length, Boolean ignoreCase)
   at _13._1(Boolean , Int32 , String )
   at ActiproSoftware.SyntaxEditor.IntelliPromptMemberList.ActiproSoftware.SyntaxEditor.ISyntaxEditorEditModeHandler.OnSelectionChanged(SelectionEventArgs e)
   at ActiproSoftware.SyntaxEditor.SyntaxEditor._1(SelectionEventArgs )
   at ActiproSoftware.SyntaxEditor.EditorView._1(Object , SelectionEventArgs )
   at ActiproSoftware.SyntaxEditor.Selection._1(SelectionEventArgs )
   at ActiproSoftware.SyntaxEditor.Selection._1(Boolean )
   at ActiproSoftware.SyntaxEditor.Selection._1(DocumentModificationEventArgs )
   at ActiproSoftware.SyntaxEditor.SyntaxEditor._2(Object , DocumentModificationEventArgs )
   at ActiproSoftware.SyntaxEditor.Document._1(DocumentModificationEventArgs )
   at ActiproSoftware.SyntaxEditor.Document._2(DocumentModificationEventArgs )
   at ActiproSoftware.SyntaxEditor.Document._1(DocumentModification )
   at ActiproSoftware.SyntaxEditor.Document._1(DocumentModificationType , Int32 , Int32 , String , Boolean )
   at ActiproSoftware.SyntaxEditor.Document.UndoableInsert(DocumentModificationType type, Int32 offset, Int32 length, String text)
   at ActiproSoftware.SyntaxEditor.EditorView._1(String )
   at ActiproSoftware.SyntaxEditor.EditorView.InsertText(String text)
   at ActiproSoftware.SyntaxEditor.Commands.TypingCommand.Execute(EditCommandContext context)
   at ActiproSoftware.SyntaxEditor.MacroRecording._1(EditCommand , EditCommandContext )
   at ActiproSoftware.SyntaxEditor.EditorView._1(EditCommand , Boolean )
   at ActiproSoftware.SyntaxEditor.SyntaxEditor._1(EditorView , Keys , Char , Boolean )
   at ActiproSoftware.SyntaxEditor.SyntaxEditor.OnKeyPress(KeyPressEventArgs e)
   at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
   at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
   at System.Windows.Forms.Control.WmKeyChar(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at ActiproSoftware.SyntaxEditor.SyntaxEditor.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Synergy_IDE.Splash.Main(String[] args) in C:\Source\Synergy IDE\Splash.cs:line 14