JTCS Unit Viewer Unhandled exception Occurred

Hi dear,
I don’t know about this error.
Why this error appear I don’t know please tell me its solution.
I say thanks in advance for providing help.

JTCS Unit Viewer
Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.
Could not find a part of the path ‘C:ProgramFilesMatrx GamesJohn Tiller’s Campaign Series East Front’.
Details Continue Quit
Regards.
