Problems accessing repository data

[Sue Maurizio]

Hello,
I'm currently writing a simple add-in, written in C#, with a menu item that should open a dialog showing the connection string of an EA project. Since I do not want to get the project opened in my EA instance, I created a new Repository object and then invoked rep.OpenFile(file path).
The problem is, after I select my menu item I get an error dialog telling me "This action cannot be completed because the other program is busy". If I wait some seconds and click on "Retry", I get my connection string correctly printed. Is there something I can do to solve this problem?
Thanks,
S.M.