Can’t reach admin page

Hi everyone,

I can’t reach the admin page of my website anymore. The error message says “Internal Server Error – the server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administration at admin to inform them of the time this error occurred, and the actions you performed just before this error. Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.”

Can someone please help me on how to handle this? Thank you.

Best,
Kerstin

The page I need help with: [log in to see the link]