I don't think this is a cache issue as when you go to the homepage it shows an error saying something went wrong.
But here is my php flarum info
:
Flarum core 0.1.0-beta.7
PHP 7.0.30-0ubuntu0.16.04.1
Loaded extensions: Core, date, libxml, openssl, pcre, zlib, filter, hash, pcntl, Reflection, SPL, session, standard, mysqlnd, PDO, xml, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, json, exif, mcrypt, mysqli, pdo_mysql, Phar, posix, readline, shmop, SimpleXML, sockets, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xmlreader, xmlwriter, xsl, zip, Zend OPcache
EXT flarum-approval v0.1.0-beta.7
EXT flarum-bbcode v0.1.0-beta.5
EXT flarum-emoji v0.1.0-beta.6
EXT flarum-english v0.1.0-beta.7
EXT flarum-flags v0.1.0-beta.7
EXT flarum-likes v0.1.0-beta.6
EXT flarum-lock v0.1.0-beta.7
EXT flarum-markdown v0.1.0-beta.5
EXT flarum-mentions v0.1.0-beta.7
EXT flarum-sticky v0.1.0-beta.7
EXT flarum-subscriptions v0.1.0-beta.6
EXT flarum-suspend v0.1.0-beta.7
EXT flarum-tags v0.1.0-beta.8
Base URL: https://(mysite)/community
Installation path: /var/www/html/community