error

Java Exception Thrown: java.lang.IllegalStateException: CauseStackManager called from off main thread (current='Thread{class=class java.lang.Thread, name=ComputerCraft-Coroutine-5, priority=5, group=java.lang.ThreadGroup[name=ComputerCraft-Coroutine,maxpri=10]}', expected='Thread{class=class java.lang.Thread, name=Server thread, priority=5, group=net.minecraftforge.fml.common.thread.SidedThreadGroup[name=SERVER,maxpri=10]}')!