'500 Internal Server Error' after upgrade to latest version of ProcessWire

[Guest julianberlin]

I just upgraded my website to the latest version of ProcessWire.

Now all pages except the homepage don't open anymore (instead, the 500 Internal Server Error appears):

Quote

Internal Server Error

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

Please contact the server administrator at 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.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

 

I also can't access the backend of ProcessWire anymore (my-domain.com/processwire)

Please help!

[Guest julianberlin]

Nevermind, I found the solution myself.

I think the .htaccess file was overwritten. Once I added the following code, everything went back to normal:

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,L]