Loaded Modules: core mod_so mod_watchdog http_core mod_log_config mod_logio mod_version mod_unixd mod_access_compat mod_actions mod_alias mod_auth_basic mod_authn_core mod_authn_file mod_authz_core mod_authz_host mod_authz_user mod_autoindex mod_cgi mod_cgid mod_deflate mod_dir mod_env mod_expires mod_fcgid mod_filter mod_headers mod_mime mpm_itk prefork mod_negotiation mod_php7 mod_proxy mod_proxy_fcgi mod_reqtimeout mod_rewrite mod_rpaf mod_setenvif mod_status mod_suexec mod_vhost_alias
I switched the theme to the standard one that you recommended, disabled all active plugins except yours, the error is still repeated, there are no errors in the server logs