Data Environment Connection Problem

I am doing a project using vb with ms access. I have set a password to the ms access. It is work fine throught out the project, but while try to add a report using data environment, the connection fail. I use the jet 4.0 provider to test the connection, it
will give me the error message below:

" Test connection failed because of an error in initializing provider.
Cannot start your application. The workgroup information file is missing or opened exclusively by another user."

while i use the oledb to test the connection in data environment, it is ok.

And i wonder why this happen, and how i resolve the connection problem using the jet 4.0 in data environment.

thank in advance for any help:)