500 error

[sattva]

Error

[Mon Nov 18 18:36:24.755920 2019] [proxy_fcgi:error] [pid 12026:tid 140639987500800] [client 195.69.223.251:36466] AH01071: Got error 'PHP message: PHP Fatal error: Cannot redeclare Document::$noindex in /home/forbs/public_html/system/storage/modification/system/library/document.php on line 24\n'

[neoart]

I culd just asume that is some OpenCart.

If  I am correct The issue you're reporting is not related from the core but rather from an extension