安装的是toad for SQL server 3.0  
安装完毕打开时提示连接错误：
System.NullReferenceException
Object reference not set to an instance of an object.
Stack Trace:
   at Quest.Toad.ConnectionManager.ConnectionControl.UpdateActions()
   at Quest.Toad.ConnectionManager.ConnectionControl..ctor()
   at Quest.Toad.ConnectionManager.ConnectionForm.InitializeComponent()
   at Quest.Toad.ConnectionManager.ConnectionForm..ctor(ConnectMediator connectInfo)
   at Quest.Toad.ConnectionManager.ConnectionForm.ShowConnectionDialog(ConnectMediator connectInfo)
   at Quest.Toad.ConnectionManager.ConnectionForm.ShowConnectionDialog(ActionEntry entry)

我用SQL server可以正常链接数据库   所以不知道问题出在哪里   请教各位。

在线等ing......