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[Felix]

Hi,

I forgot to mention that the GS cms has an inbuild error reporter.

Just turn it on and maybe it will show helpful information
about the error.

Go to the webroot of your GS cms installation and look for the file gsconfig.php
Open it in your favorite editor and uncomment the following line:

#define('GSDEBUG', TRUE);

so it looks like this

define('GSDEBUG', TRUE);

Then save the gsconfig.php file again and reload your webpages
to see any error report.

here are 3 pics to show what I mean:

https://ibb.co/ZfzQ9TH
https://ibb.co/6tkJjHz
https://ibb.co/6vFQ5Dy