BUG REPORT HTTP Error 500

[maag]

Hi, 

When I try to save my new modifications onwww.xx.ch/admin, I get the following error message: 
This page is not working at the moment. www.xx.ch cannot process this request at the moment. HTTP Error 500.

I cannot edit anything. Can someone help me with this problem? 

Greetings, Maag

[multicolor]

What php and version gs?

[maag]

What php and version gs?

PHP: [font=Arial, "Helvetica Neue", Helvetica, sans-serif]
8.1.17 - OK[/font]

[font=Arial, "Helvetica Neue", Helvetica, sans-serif]GetSimple Version
3.3.16
Die aktuelle Version ist installiert[/font]

[multicolor]

What php and version gs?

PHP: [font=Arial, "Helvetica Neue", Helvetica, sans-serif]
8.1.17 - OK[/font]

[font=Arial, "Helvetica Neue", Helvetica, sans-serif]GetSimple Version
3.3.16
Die aktuelle Version ist installiert[/font]

https://getsimplecms-ce.github.io/ try this version.