Where did you install mb_LyricsReloaded.dll? There should be only one copy on the PC.
Yeah, by the looks of it, you might still have an old LyricsReloaded install.
What's the plugin version number appearing on the log file that you submitted?
The error "Unknown provider type search" means the plugin cannot recognize the "search loader" which is something I introduced when I began working on this plugin.
So confirm the plugin version you have there.
Do you have any "fuzzy" (Genius, Deezer, Musixmatch) versions of the providers appearing in your MusicBee providers list? (I doubt)