Hi Saverio,
That appears to be a programming error in the server, thanks for letting me know.
Please could you copy/rename the sample .ini file as PF3WebDisplay.ini and add the line 'Debug=2' to the end of the file (no quote marks).
If you can then start the program again and post the file PF3WebDisplay.log here - you'll need to attach it as a zip file.
That will help me pin the problem down - it's happening as a result of what it's receiving from PF3, I just need to adjust something.
Thanks,
Martin