VB 致命错误！！！Runtime Error

标题是:Microsoft visual C++ Runtime Library    Runtime Error!
   Program:C:\Program Files\Microsoft visual Studio \VB98\vb6.exe
      This application has requested the Runtime to terminate it in an unusual way.
   Please contact the  application's support team for more information.
再将CAD数据转换成GIS的mdb格式时，用VB6.0写个工具进行数据转换时，突然出现了这个错误，点击确定后，整个vb窗口就退出了，请问大侠们这是肿么回事？如何解决, 另外，我要转换的数据量很大.