Everything's ok. I don't think it's worth the effort to test it again to see what caused it. I solved the problem in a roundabout way

First of all thank you for your answer. I found a cumbersome solution. I played the faulty MP3 with the VLC_Player while recording the audio signal with Audacity. I saved the recording as an MP3 and that's it :-) So the error had apparently continued to be incorporated when converting the faulty ...

I noticed that when I was using the button, a single Mp3 file was causing me an error. However, this MP3 works perfectly with other programs such as VLC Player. Even if I convert the MP3 to another format, e.g. WAV or WMA, the same problem arises. I also tried older versions of Jingle Palette, same ...