Using:
Forge-12.17.0.1950

TechReborns Side:
RebornCore-1.9.4-2.5.1.36
TechReborn-1.9.4-1.3.1.100

TConstructs Side:
Mantle-1.9.4-0.10.1
Tinker's Construct-1.9.4-2.3.1

Crashlog:
http://pastebin.com/hqatNnrw

Explaination:
Okey so the reason i'm pretty sure this is caused by TechReborn is cause it only happens if i have
TechReborn-1.9.4-1.3.1.100 enabled it crashes with this crash, but if i disable TechReborn it works just fine. Loads up no issues.

Sorry for the Derp Btw :S

Okey god dammit.... I'm gonna update this accidental enter press

ok, no worries :)

From Modmuss Stream:

"Okey so i've got a answer;
Turning:
B:"Compat:CompatModuleTinkers"=true
To
B:"Compat:CompatModuleTinkers"=false

Fixes that Crash