Internal Error Message in PHP logs

We went to the payment page and it was blank. I opened the logs and found this error message.

[Thu Oct 17 16:10:04.344729 2019] [proxy_fcgi:error] [pid 11168:tid 140424030979840] (20014)Internal error (specific information not available): [client] AH01075: Error dispatching request to : (passing brigade to output filters), referer:

Any idea on how to solve this? OJS Thanks.