I bought your add-on, and it is not working. I have Standard Library 1.4.1 and Multi Prefix 2.8.14 on my Xenforo v2.2.1 and see this error:
ErrorException: [E_WARNING] Declaration of SV\StandardLib\Finder\SqlJoinTrait::sqlJoin(string $rawJoinTable, string $alias, array $columns, bool...