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Internal Exception: io.netty.handler.codec.DecoderException: Received unexcepted null component

Server is on 1.16.5 with possibility to join on higher minecraft version(ViaVersion plugin). Problem is only on higher version(1.19+. Tested with 1.16, 1.17, 1.18 and ...
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1.16.5 it wont start and keeps giving me this message LostCities (lostcities) encountered an error during the common_setup event phase java.lang.IllegalStateException: Not a ...

at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:71) [?:?] {re:classloading} at net.minecraftforge.fml.client ...