Forge 1448 ( recommended stable for MC 1.7.10 )

RF Tools 3.01

Either single player or connecting via SMP the following message is spammed then "Fatal Error" message on client

http://hastebin.com/opicilocel.avrasm

Do you have some kind of mod that does something special with mossy cobblestone? RFTools is crashing while trying to generate a dimlet for mossy cobblestone.

Can I see the full log

Complete client log https://paste.ee/p/qI2zd
From startup, creating/starting new single player instance to client crash

I just did a blind fix for this. Can you try the development version of rftools from here and see if that helps:

https://drone.io/github.com/McJty/RFTools/files

Thanks

Single Player - No issue.
SMP/Server - No issue.

I'll close this as I consider this issue resolved

Although I am curious as to why this issue happened.
Was it in fact a mod that i was running? The logfile i provided before has a complete list of mods from line 73 - 328

It is probably a mod that you're using but I don't know which one. I protected against this by simply checking for this and not generating that dimlet (in this case mossy cobblestone).