if u look at the crashlog it tells u what mod is causing it to crash, but incase thats a bit to hard




UCHE rftools{4.23} [RFTools] (rftools-4.23.jar)
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed
'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized
'A' = Available 'D' = Disabled 'E' = Errored

"java.lang.RuntimeException
at cpw.mods.fml.common.registry.VillagerRegistry.registerVillagerId(VillagerRegistry.java:125)
at mcjty.rftools.village.VillageSetup.villagerSetup(VillageSetup.java:12)
at mcjty.rftools.CommonProxy.init(CommonProxy.java:121)
at mcjty.rftools.ServerProxy.init(ServerProxy.java:16)
at mcjty.rftools.RFTools.init(RFTools.java:167)
...
EnderIO: Found the following problem(s) with your installation:
* The RF API that is being used (1.7.10R1.0.2 from <unknown>) differes from that that is reported as being loaded (1.7.10R1.0.10 from Mekanism-1.7.10-9.1.1.1031.jar).
It is a supported version, but that difference may lead to problems."

I'm not sure of this solution, but try uninstalling RF Tools.