[Achim Pfeiffer]

Hello all,
my name is Achim Pfeiffer from Trier.
I have been using Mobil Sheet Pro for about 2 years.
Yesterday I had this error message for the first time with some songs:



So far I had no problems with the songs in question.
First I restored the file from my backup, unfortunately without success.
When I recreated the file, it worked of course.
Can someone tell me something about the error message??... and how to possibly fix the error?

Thanks a lot