Starting my server up after adding SurvivalPlus Lightsabers and SurvivalPlus on 1.19:
Caused by: java.lang.RuntimeException: Rerached side issue when loading REI plugin by SurvivalPlus Lightsabers. Please use "rei_server", "rei_client" or "rei_common" instead.

I can send more info if need be. When starting my mods on my client side a similar message popped up and I was able to simply ignore it and play normally, however I cannot start my server with this mod installed. I hope to help you get this fixed
rei.log
latest.log
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Fix and released with 35ce816

Nah, shouldn't be WTHIT related. It looks like REI changed some stuff in 1.19 that I need to adapt to. Will release a fix within the next few days. In the meanwhile, you can remove REI from your server and still use it on the client without much difference.