Weird "Authorization Problem Error 401"

Dear MuseScore,

I am a creator on this platform that makes mediocre arrangements of hymns and songs. Now see, the thing is, is that recently I'm trying to publish an arrangement of "O Sacred Head, now wounded", and I get the fact that it may be someone else's song, but it's an arrangement made for flute, oboe, bassoon, two violins, viola, cello, and contrabass. I'm not entirely sure about this authorization error but I'm very sure I did not copy anyone, please fix.

Thank You! <3