When I create a new user, I get the error message "500 Internal Server Error POST https://forum.ecocounts.community/api/users" after the "please try to reload the page". Reloading the page is fine, then all becomes OK.
I see this in the apache log:
[Sun Sep 11 16:38:18.181516 2022] [proxy_fcgi:error] [pid 2259747:tid 139873777497856] [client 51.155.201.220:50292] AH01071: Got error 'PHP message: PHP Fatal error: Cannot use ::class with dynamic class name in /home/carbonc/sites/flarum/storage/views/9b7fa1be6c50ebe5e1807399018192674d974eaa.php on line 5', referer: https://forum.ecocounts.community/users