IDETalk, error messages on frame deactivation Follow

After my first attempt at using IDETalk, every attempt to close the frame now results in the error in the attached file.

The message is:

Cannot save project:
Could not instantiate converter: com.thoughtworks.xstream.converters.extended.ThrowableConverter

Every time I deactivate the main IDEA frame, the dialog appears, which is very irritating. I'm obliged to quit IDEA to get rid of the message.

Thanks,
Chris