A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Head --
Thread: Client thread
Stacktrace:
	at net.minecraftforge.client.model.pipeline.UnpackedBakedQuad$Builder.<init>(UnpackedBakedQuad.java:105)
	at net.minecraftforge.client.model.ItemLayerModel.buildQuad(ItemLayerModel.java:397)
	at net.minecraftforge.client.model.ItemLayerModel.buildSideQuad(ItemLayerModel.java:375)
	at net.minecraftforge.client.model.ItemLayerModel.getQuadsForSprite(ItemLayerModel.java:230)
	at net.minecraftforge.client.model.ItemLayerModel.bake(ItemLayerModel.java:117)
	at slimeknights.tconstruct.library.client.model.MaterialModel.bakeIt(MaterialModel.java:76)
	at slimeknights.tconstruct.library.client.model.ToolModel.bake(ToolModel.java:97)
	at net.minecraftforge.client.model.ModelLoader.func_177570_a(ModelLoader.java:180)
	at net.minecraft.client.renderer.block.model.ModelManager.func_110549_a(ModelManager.java:28)
	at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a(SimpleReloadableResourceManager.java:121)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:513)

-- Initialization --
Details:
Stacktrace:
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
	at net.minecraft.client.main.Main.main(SourceFile:123)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
	Minecraft Version: 1.12.2
	Operating System: Windows 10 (x86) version 10.0
	Java Version: 1.8.0_211, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 64934040 bytes (61 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
	JVM Flags: 6 total; -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.42 Powered by Forge 14.23.5.2838 84 mods loaded, 84 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized '