here's the crash report;

---- Minecraft Crash Report ----

WARNING: coremods are present:
RenderPlayerAPIPlugin (RenderPlayerAPI-1.10.2-1.1.jar)
HFTransformer (Harvest-Festival-1.10.2-0.5.0.jar)
Contact their authors BEFORE contacting forge

// I just don't know what went wrong :(

Time: 9/23/16 4:00 PM
Description: Rendering Block Entity

java.lang.ClassCastException: joshie.harvest.npc.entity.EntityNPCVillager cannot be cast to net.minecraft.entity.player.EntityPlayer
at com.mrcrayfish.skateboarding.client.model.ModelPlayerOverride.render(ModelPlayerOverride.java:120)
at api.player.model.ModelPlayerAPI.render(Unknown Source)
at api.player.model.ModelPlayerAPI.render(Unknown Source)
at net.minecraft.client.model.ModelPlayer.func_78088_a(SourceFile)
at joshie.harvest.npc.render.NPCItemRenderer.renderTileEntityAt(NPCItemRenderer.java:44)
at joshie.harvest.npc.render.NPCItemRenderer.func_180535_a(NPCItemRenderer.java:16)
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_178469_a(TileEntityRendererDispatcher.java:147)
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147549_a(TileEntityRendererDispatcher.java:131)
at joshie.harvest.asm.RenderHook.render(RenderHook.java:32)
at net.minecraft.client.renderer.tileentity.TileEntityItemStackRenderer.func_179022_a(TileEntityItemStackRenderer.java)
at net.minecraft.client.renderer.RenderItem.func_180454_a(RenderItem.java:146)
at net.minecraft.client.renderer.RenderItem.func_184390_a(RenderItem.java:309)
at net.minecraft.client.renderer.RenderItem.func_184391_a(RenderItem.java:348)
at mezz.jei.gui.ingredients.GuiItemStackFast.renderSlow(GuiItemStackFast.java:148)
at mezz.jei.gui.ingredients.GuiItemStackFastList.render(GuiItemStackFastList.java:148)
at mezz.jei.gui.ItemListOverlay.drawScreen(ItemListOverlay.java:329)
at mezz.jei.GuiEventHandler.onDrawBackgroundEventPost(GuiEventHandler.java:86)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_70_GuiEventHandler_onDrawBackgroundEventPost_BackgroundDrawnEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:168)
at net.minecraft.client.gui.GuiScreen.func_146276_q_(GuiScreen.java:590)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:73)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:591)
at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:382)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1094)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1076)
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(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)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Client thread
Stacktrace:
at com.mrcrayfish.skateboarding.client.model.ModelPlayerOverride.render(ModelPlayerOverride.java:120)
at api.player.model.ModelPlayerAPI.render(Unknown Source)
at api.player.model.ModelPlayerAPI.render(Unknown Source)
at net.minecraft.client.model.ModelPlayer.func_78088_a(SourceFile)
at joshie.harvest.npc.render.NPCItemRenderer.renderTileEntityAt(NPCItemRenderer.java:44)
at joshie.harvest.npc.render.NPCItemRenderer.func_180535_a(NPCItemRenderer.java:16)

-- Block Entity Details --
Details:
Name: null // joshie.harvest.npc.render.NPCItemRenderer.NPCTile
Stacktrace:
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_178469_a(TileEntityRendererDispatcher.java:147)
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147549_a(TileEntityRendererDispatcher.java:131)
at joshie.harvest.asm.RenderHook.render(RenderHook.java:32)
at net.minecraft.client.renderer.tileentity.TileEntityItemStackRenderer.func_179022_a(TileEntityItemStackRenderer.java)
at net.minecraft.client.renderer.RenderItem.func_180454_a(RenderItem.java:146)
at net.minecraft.client.renderer.RenderItem.func_184390_a(RenderItem.java:309)

-- Item being rendered --
Details:
Item Type: joshie.harvest.npc.item.ItemNPCSpawner@4ba047
Item Aux: 12
Item NBT: null
Item Foil: false
Stacktrace:
at net.minecraft.client.renderer.RenderItem.func_184391_a(RenderItem.java:348)
at mezz.jei.gui.ingredients.GuiItemStackFast.renderSlow(GuiItemStackFast.java:148)
at mezz.jei.gui.ingredients.GuiItemStackFastList.render(GuiItemStackFastList.java:148)
at mezz.jei.gui.ItemListOverlay.drawScreen(ItemListOverlay.java:329)
at mezz.jei.GuiEventHandler.onDrawBackgroundEventPost(GuiEventHandler.java:86)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_70_GuiEventHandler_onDrawBackgroundEventPost_BackgroundDrawnEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:168)
at net.minecraft.client.gui.GuiScreen.func_146276_q_(GuiScreen.java:590)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:73)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:591)
at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:382)

-- Screen render details --
Details:
Screen name: net.minecraft.client.gui.inventory.GuiContainerCreative
Mouse location: Scaled: (446, 15). Absolute: (893, 674)
Screen size: Scaled: (683, 353). Absolute: (1366, 705). Scale factor of 2

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['ItSureStingz'/276, l='MpServer', x=-13.55, y=79.00, z=97.64]]
Chunk stats: MultiplayerChunkCache: 289, 289
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-28,64,92), Chunk: (at 4,4,12 in -2,5; contains blocks -32,0,80 to -17,255,95), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 53537 game time, 25595 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 111 total; [EntityCreeper['Creeper'/1797, l='MpServer', x=-52.50, y=14.00, z=156.50], EntitySkeleton['Skeleton'/2070, l='MpServer', x=17.30, y=33.00, z=154.44], EntitySkeleton['Skeleton'/2071, l='MpServer', x=18.50, y=33.00, z=156.50], EntityCreeper['Creeper'/1817, l='MpServer', x=-72.50, y=42.00, z=173.50], EntityCreeper['Creeper'/2330, l='MpServer', x=-20.50, y=47.00, z=52.50], EntityCreeper['Creeper'/1818, l='MpServer', x=-75.50, y=42.00, z=177.50], EntityCreeper['Creeper'/1819, l='MpServer', x=-76.50, y=42.00, z=177.50], EntityZombie['Zombie'/2335, l='MpServer', x=-1.50, y=8.00, z=74.50], EntityPlayerSP['ItSureStingz'/276, l='MpServer', x=-13.55, y=79.00, z=97.64], EntityCreeper['Creeper'/1587, l='MpServer', x=-22.50, y=41.00, z=86.50], EntitySkeleton['Skeleton'/2359, l='MpServer', x=-93.50, y=34.00, z=155.50], EntitySkeleton['Skeleton'/1606, l='MpServer', x=-25.53, y=50.00, z=50.28], EntitySkeleton['Skeleton'/2377, l='MpServer', x=-69.50, y=27.00, z=174.50], EntitySkeleton['Skeleton'/2378, l='MpServer', x=-70.50, y=27.00, z=174.50], EntitySkeleton['Skeleton'/2379, l='MpServer', x=-68.50, y=29.00, z=164.79], EntitySquid['Squid'/2124, l='MpServer', x=-20.45, y=51.00, z=119.40], EntitySkeleton['Skeleton'/2380, l='MpServer', x=-71.50, y=27.00, z=172.50], EntitySquid['Squid'/2125, l='MpServer', x=-23.54, y=52.14, z=122.77], EntitySquid['Squid'/2126, l='MpServer', x=-30.15, y=53.35, z=131.20], EntitySkeleton['Skeleton'/1615, l='MpServer', x=-11.50, y=26.00, z=87.50], EntitySquid['Squid'/2127, l='MpServer', x=-24.32, y=51.00, z=129.55], EntitySquid['Squid'/2128, l='MpServer', x=-41.26, y=52.19, z=112.43], EntitySquid['Squid'/2129, l='MpServer', x=-47.14, y=51.08, z=119.18], EntitySquid['Squid'/2130, l='MpServer', x=-42.07, y=52.11, z=112.40], EntitySquid['Squid'/2131, l='MpServer', x=-43.72, y=51.68, z=113.51], EntitySquid['Squid'/2132, l='MpServer', x=-35.70, y=58.76, z=150.29], EntitySquid['Squid'/2133, l='MpServer', x=-51.40, y=62.56, z=145.53], EntitySquid['Squid'/2134, l='MpServer', x=-51.57, y=60.33, z=153.51], EntitySquid['Squid'/2135, l='MpServer', x=-46.69, y=62.45, z=151.26], EntitySquid['Squid'/2142, l='MpServer', x=37.40, y=47.00, z=123.40], EntityItem['item.item.feather'/1887, l='MpServer', x=-65.79, y=64.00, z=87.21], EntitySquid['Squid'/2143, l='MpServer', x=27.77, y=58.75, z=149.09], EntityItem['item.item.chickenRaw'/1888, l='MpServer', x=-67.05, y=64.00, z=86.45], EntitySquid['Squid'/2144, l='MpServer', x=20.58, y=56.45, z=150.56], EntitySquid['Squid'/2145, l='MpServer', x=30.10, y=56.12, z=158.74], EntitySquid['Squid'/2146, l='MpServer', x=23.38, y=56.06, z=155.48], EntityCreeper['Creeper'/2405, l='MpServer', x=55.50, y=37.00, z=85.50], EntityCreeper['Creeper'/2406, l='MpServer', x=55.50, y=37.00, z=84.50], EntityBat['Bat'/2411, l='MpServer', x=-12.01, y=15.26, z=129.39], EntityBat['Bat'/2419, l='MpServer', x=-89.60, y=29.64, z=133.30], EntityBat['Bat'/2420, l='MpServer', x=-92.23, y=29.89, z=131.71], EntitySkeleton['Skeleton'/1675, l='MpServer', x=-78.50, y=15.00, z=140.50], EntitySquid['Squid'/2198, l='MpServer', x=4.80, y=51.44, z=160.05], EntitySquid['Squid'/2199, l='MpServer', x=9.03, y=51.54, z=159.76], EntityBat['Bat'/2459, l='MpServer', x=14.49, y=24.03, z=70.25], EntitySquid['Squid'/2206, l='MpServer', x=-17.20, y=54.18, z=133.30], EntitySquid['Squid'/2207, l='MpServer', x=-7.68, y=55.92, z=132.23], EntitySquid['Squid'/2208, l='MpServer', x=-10.32, y=53.30, z=133.58], EntitySquid['Squid'/2209, l='MpServer', x=-10.35, y=53.81, z=134.82], EntityHorse['Horse'/162, l='MpServer', x=-75.00, y=67.00, z=35.08], EntityItem['item.tile.torch'/163, l='MpServer', x=-73.91, y=58.00, z=67.13], EntityItem['item.tile.sand.default'/164, l='MpServer', x=-71.70, y=62.00, z=94.87], EntityItem['item.tile.sandStone.default'/165, l='MpServer', x=-72.83, y=60.00, z=93.68], EntityItem['item.tile.sand.default'/166, l='MpServer', x=-70.20, y=61.00, z=93.76], EntityItem['item.tile.sand.default'/167, l='MpServer', x=-74.45, y=62.00, z=93.41], EntityItem['item.tile.sandStone.default'/168, l='MpServer', x=-73.13, y=60.00, z=91.53], EntityItem['item.tile.sand.default'/169, l='MpServer', x=-71.29, y=60.00, z=93.81], EntityItem['item.tile.sand.default'/170, l='MpServer', x=-70.64, y=62.00, z=93.95], EntityItem['item.tile.sandStone.default'/171, l='MpServer', x=-71.13, y=60.00, z=91.88], EntityItem['item.tile.sand.default'/172, l='MpServer', x=-74.41, y=60.00, z=91.98], EntityItem['item.tile.sand.default'/173, l='MpServer', x=-73.54, y=60.00, z=92.34], EntityItem['item.tile.sand.default'/174, l='MpServer', x=-72.34, y=61.00, z=92.41], EntityItem['item.tile.sandStone.default'/175, l='MpServer', x=-74.88, y=60.00, z=91.48], EntityItem['item.tile.sandStone.default'/176, l='MpServer', x=-73.43, y=60.00, z=90.13], EntityItem['item.tile.sand.default'/177, l='MpServer', x=-75.23, y=62.00, z=91.13], EntityItem['item.tile.sand.default'/178, l='MpServer', x=-70.97, y=60.00, z=90.41], EntityItem['item.tile.sand.default'/179, l='MpServer', x=-72.18, y=60.00, z=90.52], EntityItem['item.tile.sand.default'/180, l='MpServer', x=-70.13, y=60.00, z=90.35], EntityItem['item.tile.sand.default'/181, l='MpServer', x=-73.89, y=60.00, z=90.58], EntityItem['item.tile.sand.default'/182, l='MpServer', x=-71.51, y=60.00, z=89.13], EntityItem['item.tile.sand.default'/183, l='MpServer', x=-73.13, y=61.00, z=89.06], EntityItem['item.tile.sand.default'/184, l='MpServer', x=-73.19, y=60.00, z=93.83], EntityItem['item.tile.sand.default'/185, l='MpServer', x=-75.88, y=62.00, z=92.00], EntityItem['item.item.feather'/1977, l='MpServer', x=-71.40, y=60.00, z=93.88], EntityItem['item.tile.sand.default'/186, l='MpServer', x=-72.35, y=61.00, z=93.96], EntityItem['item.item.chickenRaw'/1978, l='MpServer', x=-71.60, y=60.00, z=93.88], EntityItem['item.tile.sand.default'/187, l='MpServer', x=-73.29, y=60.00, z=91.47], EntityItem['item.item.bone'/1979, l='MpServer', x=-71.80, y=60.00, z=93.88], EntityBat['Bat'/2491, l='MpServer', x=39.38, y=33.99, z=95.55], EntityTameableDragon['Ender Dragon'/188, l='MpServer', x=-70.95, y=64.00, z=83.00], EntityItem['item.tile.sand.default'/189, l='MpServer', x=-75.04, y=64.00, z=94.41], EntityHorse['Horse'/191, l='MpServer', x=-63.96, y=67.00, z=34.12], EntityItem['item.tile.torch'/194, l='MpServer', x=-51.13, y=48.00, z=111.55], EntitySkeleton['Skeleton'/1730, l='MpServer', x=-53.50, y=15.00, z=157.50], EntityHorse['Horse'/197, l='MpServer', x=-38.00, y=64.00, z=51.10], EntityBat['Bat'/2245, l='MpServer', x=32.26, y=21.22, z=75.36], EntityBat['Bat'/1992, l='MpServer', x=-3.16, y=27.76, z=115.48], EntityCow['Cow'/203, l='MpServer', x=58.81, y=63.09, z=31.46], EntityCow['Cow'/204, l='MpServer', x=60.38, y=63.00, z=29.18], EntityBat['Bat'/2509, l='MpServer', x=-75.90, y=29.28, z=166.35], EntityCow['Cow'/205, l='MpServer', x=65.40, y=62.71, z=22.39], EntityCow['Cow'/206, l='MpServer', x=56.41, y=65.00, z=22.15], EntitySkeleton['Skeleton'/1743, l='MpServer', x=-17.15, y=13.00, z=145.70], EntityCow['Cow'/207, l='MpServer', x=50.80, y=66.00, z=23.54], EntityZombie['entity.Zombie.name'/1744, l='MpServer', x=-17.85, y=13.00, z=144.99], EntityCow['Cow'/208, l='MpServer', x=56.33, y=62.26, z=34.14], EntityCow['Cow'/209, l='MpServer', x=51.77, y=63.09, z=75.49], EntityCow['Cow'/210, l='MpServer', x=55.51, y=64.00, z=71.45], EntityCow['Cow'/211, l='MpServer', x=65.50, y=64.00, z=30.50], EntityBat['Bat'/2006, l='MpServer', x=-65.80, y=12.85, z=147.25], EntityPig['Pig'/214, l='MpServer', x=63.23, y=62.27, z=54.82], EntitySpider['Spider'/2519, l='MpServer', x=41.50, y=31.00, z=92.50], EntityPig['Pig'/216, l='MpServer', x=61.67, y=65.00, z=75.50], EntityPig['Pig'/217, l='MpServer', x=66.01, y=64.00, z=70.15], EntityCreeper['Creeper'/2022, l='MpServer', x=-74.50, y=13.00, z=139.50], EntityCreeper['Creeper'/2023, l='MpServer', x=-73.50, y=13.00, z=140.50], EntityCreeper['Creeper'/2024, l='MpServer', x=-69.50, y=13.00, z=138.50], EntityZombie['Zombie'/2025, l='MpServer', x=-72.50, y=13.00, z=140.50], EntityCreeper['Creeper'/2552, l='MpServer', x=-11.50, y=40.00, z=82.50], EntityCreeper['Creeper'/2553, l='MpServer', x=-7.16, y=40.00, z=85.50], EntityCreeper['Creeper'/2554, l='MpServer', x=-7.92, y=40.00, z=85.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:415)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2660)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:392)
at net.minecraft.client.main.Main.main(SourceFile:124)
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: 1.10.2
Operating System: Windows 10 (x86) version 10.0
Java Version: 1.8.0_101, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 173036704 bytes (165 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP 9.32 Powered by Forge 12.18.1.2092 21 mods loaded, 21 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.19} Minecraft Coder Pack
UCHIJAAAA FML{8.0.99.99} Forge Mod Loader
UCHIJAAAA Forge{12.18.1.2092} Minecraft Forge
UCHIJAAAA RenderPlayerAPI{1.1} Render Player API
UCHIJAAAA JEI{3.10.0.261} Just Enough Items
UCHIJAAAA appleskin{1.0.4} AppleSkin
UCHIJAAAA cannibalism{3.0.0} Cannibalism
UCHIJAAAA claycraft{3.0} [Claycraft](Claycraftmod v3.0 - MC1.10.2 Forge.jar)
UCHIJAAAA cordage{1.0.1} Cordage
UCHIJAAAA csm{1.0} MrCrayfish's Skateboarding Mod
UCHIJAAAA simpleArtilleryMod{Alpha1_0_2} CustomizableArtilleryMod
UCHIJAAAA DragonMounts{r46-1.10.2} Dragon Mounts
UCHIJAAAA lootablebodies{2.2.0} DrCyano's Lootable Bodies
UCHIJAAAA F2L{1.10.2} [Flesh2Leather](Flesh2Leather [1.10.2].jar)
UCHIJAAAA samsfooddetails{1.0.1} Food Details
UCHIJAAAA foragecraft{1.7} ForageCraft
UCHIJAAAA fishing{1.4.4} Fishing Net Mod
UCHIJAAAA harvestfestival{0.5.0} Harvest Festival
UCHIJAAAA Neat{1.3-12} [Neat](Neat 1.3-12.jar)
UCHIJAAAA pplus{1.10.2} [Peaceful Plus](Peaceful Plus [1.10.2].jar)
UCHIJAAAA shellMod{Beta1_5_1} shellMod
Loaded coremods (and transformers):
RenderPlayerAPIPlugin (RenderPlayerAPI-1.10.2-1.1.jar)
api.player.forge.RenderPlayerAPITransformer
HFTransformer (Harvest-Festival-1.10.2-0.5.0.jar)
joshie.harvest.asm.HFTransformer
GL info: ' Vendor: 'Intel' Version: '4.3.0 - Build 20.19.15.4331' Renderer: 'Intel(R) HD Graphics 4400'
Launched Version: 1.10.2-forge1.10.2-12.18.1.2092
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4400 GL version 4.3.0 - Build 20.19.15.4331, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: 
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i3-4030U CPU @ 1.90GHz

Thanks for the report!
The crash is caused by MrCrayfish's Skateboarding Mod, and is actually caused by some unused code here: https://github.com/MrCrayfish/MrCrayfishSkateboardingMod/blob/master/src/main/java/com/mrcrayfish/skateboarding/client/model/ModelPlayerOverride.java#L120

I have opened a pull request with a proposed fix for this crash here: MrCrayfish/MrCrayfishSkateboardingMod#3, unfornuately we can't really do anything on our side to fix it. So you would have to remove MrCrayfish's Skateboarding Mod until the pull request is accepted :)