This is a non-fatal server thread error that occurs at login
Stacktrace here
thebrightspark commented
Pretty sure this is actually caused by your PR? #9
AhiVT commented
As referenced in #8 the mod was loading Side.CLIENT from the server side, crashing a dedicated server. #9 simply prevents the server from loading Side.CLIENT classes as passed to your helper method. The new error simply showed up as a result of a successful dedicated server mod load.