SOLVED: Can't "parse/scrape" all music into library

[alike]

I manually deleted the plugin called "Skinmanager" from the programdata\xxx folder to get rid of another possible error source. I wasn't using this anyway. I installed a lot of plugin when I started using Jellyfin just to try them out, but could be its not too good to have too many running at the same time.

I also tried "replacing all metadata" on this troubled library.
Unfortunately I am experiencing the same issue with the database:
https://privatebin.net/?e13fd270c5354823...trdTECQ7mj