Do you have an ON ERROR set in your VFP COM? Is it trying to issue a WAIT WINDOW or MessageBox? Make sure that no user interface code is buried in your COM (WAIT WINDOW, MessageBox, DoEvents, forms, etc.)

HTH

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>I create a COM object in VF6 , that object is subject for
>VB6. One of its method open a 2 Table Which is table 1 is shared
>and the other is exclusive. What happen is that, the table which is
>open in exclusive returned an error. The error is "user interface operation not allowed at this time". Can anyone tell me on how to control a table in exclusive way without occuring that error again in VB6?