Connection Problem.

Hello there, so I was joining a server called OPCLASH.COM, on Op-Factions. I joined and my screen turned to the loading screen. This error message popped up, and I have been trying to find a fix to it.

io.netty.handler.codec.Decoder.Exception: java.lang.IndexOutOfBoundsConnection: readeIndex(9) + length(1) exceeds writerIndex(9):UnpooledHeapByteBud(ridx: 9, widx: 9, cap: 9)

If anybody has a fix for it, please do help.