Error message when using the menus


Why do I always get the following error when I click on any menu button

"Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at [email protected] to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log. "

I also get this error message every time I click on the dashboard, whether I click on themes or on plugins. Then when I update, the content is back.

Our provider has no idea!

In the project there is a third-party theme "Twenty Fifteen / zysvxmgqiw", which was not installed by me. Maybe that's why and I should delete it.

At the moment, WordPress 5.7 cannot be updated either

First of all, thank you for your help

Best Regard Morph

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