Can't create Layouts/Media - maybe a database problem

CMS Version

2.3.9

Player Type

Windows

Player Version

2.257.2

Issue

Last week I set up my xibo installation. Today I wanted to create my first layout, but after creating a Layout I get this Error:
ERROR There was a problem loading the Layout!

It seems like xibo creates the layout, because I cant create the the layout with the same name again, but my Layoutlist is empty.

Addionally I am not able to create a Media. Again no entries but I get no Error while Uploading.

For me it seems i got a communication problem between the database and xibo.
Any ideas?

Only thing I tried until now was a restart from the Ubuntu, which hosts the Xibo CMS since I found nothing to that problem online.

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