How Do I Fix "[netty Client Io #5/error]: Networkdispatcher Exception"?

I keep getting kicked, after which, when I try to log back in, Wynn is responding that I'm already logged in, which I am not. When I do get back in, I've usually died and lost 2SP. Does anyone have any idea what the following error means, or how to fix it? I've searched for it on Google, but I can't find this exact error. PS: I'll be back in a few hours, so I won't be able to respond for a while. Thanks for any assistance anyone can give me.

[Netty Client IO #5/ERROR]: NetworkDispatcher exception
java.io.IOException: An existing connection was forcibly closed by the remote host

 

Someone has to have some idea of what this is. I know someone does.

 

Do you mean the "You are already logged in! Try again in 10 seconds" thing?

 

Yes.

________________________________

Holy Shitake Mushrooms!
Look at this part, just preceding the crash:

Spoiler

[11:36:21] [Client thread/ERROR]: Item entity 291544 has no item?!
Repeat the above, 17 times, then
[11:36:22] [Client thread/ERROR]: Item entity 291670 has no item?!
Repeat the above, 12 times, then
[11:36:23] [Client thread/ERROR]: Item entity 291763 has no item?!
Repeat the above, 146 times, then
[11:36:24] [Client thread/ERROR]: Item entity 291799 has no item?!
Repeat the above, 209 times, then
[11:36:27] [Client thread/INFO]: [CHAT] [+937 ?] Cleared all potion effects.
[11:37:01] [Client thread/INFO]: [CHAT] Putrid has logged into server WC6 as an Hunter
[11:37:07] [Client thread/INFO]: [CHAT] Putrid has logged into server WC6 as an Assassin
[11:37:52] [Client thread/ERROR]: Item entity 303901 has no item?!
Repeat the above, 209 times, then
[11:37:54] [Client thread/ERROR]: Item entity 303994 has no item?!
Repeat the above, 139 times, then
Three chat messages, then
[11:40:26] [Netty Client IO #5/ERROR]: NetworkDispatcher exception
java.io.IOException: An existing connection was forcibly closed by the remote host
at sun.nio.ch.SocketDispatcher.read0(Native Method) ~
and a bunch more information

What is going on, here?

 

The "you are already logged in" error fixes itself every few minutes, it is because you disconnected in a weird way. As far as your client crash goes, I can't really help you other than to tell you to reinstall minecraft, or try 1.9 if you are on 1.8 or try 1.8 if you are on 1.9.

 

The mighty server Jesus has spoken!

 

Sounds like I'm going to try a new install setup. Pray to the deities of MC that it works.