Got this earlier when I grabbed IC2 1.62:
java.lang.NoSuchMethodError: ic2.api.IWrenchable.wrenchCanSetFacing(Lxb;I)Z
at ic2.common.ItemToolWrench.onItemUseFirst(ItemToolWrench.java:81)
at ic2.common.ItemToolWrenchElectric.onItemUseFirst(ItemToolWrenchElectr
ic.java:50)
at acq.a(PlayerControllerSP.java:177)
at net.minecraft.client.Minecraft.c(SourceFile:1220)
at net.minecraft.client.Minecraft.k(SourceFile:1545)
at net.minecraft.client.Minecraft.x(SourceFile:709)
at net.minecraft.client.Minecraft.run(SourceFile:662)
at java.lang.Thread.run(Unknown Source)
I wrenched a Geothermal Generator. Also this produced a "Saving Chunks" crash.