var
cad:AcadApplication;
cad:=AcadApplicationClass.Create;-》执行到这句时，出现如下的错误：
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Debugger Exception Notification
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Project SDocument.exe encountered unhandled exception class System.Runtime.InteropServices.COMException with message 'COM object with CLSID {1365A45F-0C8F-4806-A26A-6B22AD37EC66} is either not valid or not registered.'.
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应该如何解决呀？
