@martin_d and @afreakm

I just got mine from GLS.

The problem is really a invalid package number. The guy tried several times to scan the barcode of the package number but his device reported always an error. He said that the number starts with 000 and that is invalid. First he even said that he would have to take the package with him because he can't scan it and so I could not sign that I got it. But finally I could convince him that every GLS station on the way from the netherlands (there it comes from) must have had the same problem.