Hi SWD team

I'm just wondering if i can have any help for fixing the problem with joining the dalek mod server because when I try to join I keep having Minecraft crash and it says this error"java.lang.ClassCastException: net.minecraft.client.entity.EntityPlayerSP cannot be cast to net.minecraft.entity.player.EntityPlayerMP

Exit Code: -1 
can I have help?
kind regards BLUEWITHER1845

is it a paid account 

 If it wasnt, it would come up with "Failed to verify username!", as connecting to a server with a real account contacts authserver.mojang.com in order to verify username and UUID, however cracked clients block that, therefore can only join offline mode servers.

Do you have any other mods installed? This looks like a crash thrown by another mod incorrectly accessing the multiplayer player instance on the client