Got the same issue today:
6395.530 Error MainLoop.cpp:1285: Exception at tick 10519186: The mod QCraft (0.1.6) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event QCraft::craft-one-from-cursor (ID 187)
Entity is not ghost.
stack traceback:
[C]: in function 'index'
__QCraft/control.lua:9: in function <QCraft/control.lua:6>
(...tail calls...)
QCraft/control.lua:31: in function <QCraft/control.lua:30>
6395.531 Error ServerMultiplayerManager.cpp:91: MultiplayerManager failed: "The mod QCraft (0.1.6) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event QCraft::craft-one-from-cursor (ID 187)
Entity is not ghost.
stack traceback:
[C]: in function 'index'
__QCraft/control.lua:9: in function <QCraft/control.lua:6>
(...tail calls...)
QCraft/control.lua:31: in function <QCraft/control.lua:30>"
6395.531 Info ServerMultiplayerManager.cpp:784: updateTick(10519186) changing state from(InGame) to(Failed)
6395.531 Quitting: multiplayer error.
If it helps :
I went out of SE's Satellite Link than hit ALT+Q on an entity ghost and booum.