5.3.2, unser Freund, der unknown tag "s"

Hier das acess log, Fehler kommt leider immer noch

 

89.13.92.105 - - [13/Sep/2017:14:02:59 +0200] "GET /backend/login/getLoginStatus?_dc=1505304178713 HTTP/2.0" 200 68 "https://xxx.de/backend/" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0"
84.173.214.62 - - [13/Sep/2017:14:03:03 +0200] "GET /PaymentPaypal/return/express/1?token=EC-11A65783UT774904Y&PayerID=L4GKHJL67USRU HTTP/2.0" 302 0 "https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-11A65783UT774904Y" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0"
84.173.214.62 - - [13/Sep/2017:14:03:03 +0200] "GET /checkout HTTP/2.0" 500 0 "https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-11A65783UT774904Y" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0"