It seems like you hitting this following error after you uninstalled Jomsocial extension on your site.

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; plgSystemForceAvatar has a deprecated constructor in /home2/conexio2/public_html/plugins/system/forceavatar/forceavatar.php on line 13



Warning: require_once(/home2/conexio2/public_html/components/com_community/libraries/core.php): failed to open stream: No such file or directory in /home2/conexio2/public_html/plugins/system/forceavatar/forceavatar.php on line 11



Fatal error: require_once(): Failed opening required '/home2/conexio2/public_html/components/com_community/libraries/core.php' (include_path='.:/opt/alt/php70/usr/share/pear') in /home2/conexio2/public_html/plugins/system/forceavatar/forceavatar.php on line 11

Based on that error message, it seems like it point to this 3rd party plugin 'forceavatar' required those Jomsocial php core file, since all these Jomsocial php file already removed, so caused this error.

I already renamed this plugin folder from /public_html/plugins/system/forceavatar_ , it should work fine now.