Forestry Internal Server Error - FTB Unleashed

[Chrome_Enigma]

I'm running a small unleashed server for a few friends, and we're experiencing strangeness when using forestry's mail system. If we attempt to send a letter with improper postage, or attempt to write a letter from a stack of letters the server kicks you off claiming an internal server error. This also happens to players seemingly at random when sending letters.

Is this a known forestry bug? I'd like to fix it because it's putting people off using the mail.

We are also running tickthreading and forge essentials

 

[Wagon153]

Try going up or down a forestry version. Or try it without tickthreading.