The error: "A TileEntity type com.hexagon.tileentity.TileEntityHephaestusBench has throw an exception trying to write state. It will not persist."

Cause: Unloading and then loading a chunk with the bench in it.

Effect: Server will not start and outputs said message.

Pastebin of end of the server log: http://pastebin.com/WA8usSUw

Version: 4.1 - 1.7.10

Nevermind, it's an error but the server wasn't crashed from it.