Tick Handler Client

[Hades4950]

Whenever I try to load up my minecraft, it works, but when I attempt to join a server this pops up.
The game crashed whilst unexpected error
Error: java.lang.IllegalAccessError: tried to access field net.minecraft.client.renderer.ItemRenderer.field_78454_c from class gravigun.client.core.TickHandlerClient

 

If someone could help in any way, thank you.

Edited May 29, 2017 by Hades4950
Added an m at the end of server

[Hades4950]

Thank you.