Break mode means the debugger is breaking into your code because something of interest happened. In this case it was an unhandled exception (error). Fortunately the debugger will show you the line of code it is failing on (generally) along with the callstack as to how you go there and the actual exception message which should indicate the file that it could not find.
When the debugger breaks in please post the exception message and callstack or a screenshot of the error information so we can understand where the error is. If your code is trying to load some file then that is most likely the place and showing us that code would also help.