Error while trying to read an AVI file with stream.GetFrameOpen()

Question

I am trying to use this package "https://www.codeproject.com/Articles/7388/A-Simple-C-Wrapper-for-the-AviFile-Library". It is called "a simple c# wrapper for the avifile library"

I am trying to get an image from an avi file. This is the code from their website:

    AviManager aviManager = new AviManager(txtAviFileName.Text, true);
    VideoStream aviStream = aviManager.GetVideoStream();
    aviStream.GetFrameOpen();

But it always gets an error in GetFrameOpen() in VideoStream.cs which is called from the code just above. All it says is "Exception in VideoStreamGetFrameOpen!" without any details.

The weird thing is the supplied demo AVI (only 3 frames long) works but not with any of my AVI files. Has anyone encountered this before?