Thank you for the feedback...
I tried to Bridge in the DSI File without a Bridge Processor Plugin and it worked very fine.
So my DSI File is not the problem...
But I can not imagine there is something wrong with the BP Plugin, because normally when you have problems with the sourcecode you get an output inside the log files or a more detailed error message...
But this error message (in the screenshot) looks like Capital itself has a problem with sth and I dont know why