Minecraft Version:
1.10.2
Inventory Tweaks Version:
1.61-58

java.lang.NoSuchMethodError: invtweaks.api.IItemTreeItem.getExtraData()Lnet/minecraft/nbt/NBTTagCompound;
at invtweaks.InvTweaksItemTree.lambda$getItems$5(InvTweaksItemTree.java:191)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at invtweaks.InvTweaksItemTree.getItems(InvTweaksItemTree.java:191)
at invtweaks.InvTweaksHandlerSorting.getItemOrder(InvTweaksHandlerSorting.java:561)
at invtweaks.InvTweaksHandlerSorting.(InvTweaksHandlerSorting.java:91)
at invtweaks.InvTweaks.handleSorting(InvTweaks.java:614)
at invtweaks.InvTweaks.onSortingKeyPressed(InvTweaks.java:257)
at invtweaks.InvTweaks.onTick(InvTweaks.java:513)
at invtweaks.InvTweaks.onTickInGame(InvTweaks.java:193)
at invtweaks.forge.ClientProxy.onTick(ClientProxy.java:65)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_396_ClientProxy_onTick_ClientTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:72)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:168)
at net.minecraftforge.fml.common.FMLCommonHandler.onPreClientTick(FMLCommonHandler.java:339)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1650)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1055)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

I'm guessing another mod somewhere is overwriting the API files with an older (pre-1.9) version.