Internal Server Error after new Hard drive

Hello there,

I recently added an external hard drive to my nextcloudpi and used the “format USB drives” option in the admin panel.

Outount is / was activated.

After those two actions I can now only login into the admin pannel and the user site gives:

Internal Server Error

The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.

Please help me recoverfrom my mistakes and help me learn from it.

ncp-report output is (I hope it gets correctly formatted):

ncp-report (too big to paste directly here)