Locally available server versions

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Fatal error: Uncaught Error: Call to a member function get_serverjar() on null in /var/www/minecraft.hawa.nl/html/rfwadmin/fsroot/var/lib/minecraft/web/include/tabs/serverjar.php:5 Stack trace: #0 {main} thrown in /var/www/minecraft.hawa.nl/html/rfwadmin/fsroot/var/lib/minecraft/web/include/tabs/serverjar.php on line 5