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Currently supported: All versions

I cant join my server

tomncrdbl
in Support & Bug Reports

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Internal Exception: io.netty.handler.coded.DecoderException: java.lang.NullPointerException: Cannot invoke "net.minecraft.network.ConnectionProtocol$PacketSet.m_178327_(int,net.minecraft.network.FriendlyByteBuf)" because the return value of "java.util.Map-get(object) is null

thats the error code, does anybody know whats wrong?

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