internal exception java.lang.classcastexception net.minecraftforge.fml.common.network.handshake.fmlhandshakemessage$HandshakeAck cannot be cast to net.minecraftforge.fml.common.network.handshake.fmlhandshakemessage$registrydata
error pops up when someone tried to log into my modded server with hamachi since the server is setup to use hamachi and this popped up on there side i can get in fine they cannot they get this error if you know anything about it please give reply or if this is an error thats been fixed in the half star version please let me know I am currently using minecraft forge 12.18.2.2097 I am sorry if this is not the place for asking for this kind of help here then please tell me where to go because im so lost i've googled couldn't find the error listed anywhere unless googling entire thing wasn't going to work but im trying hard to fix this issue
FML Client
FML Server
