Hello! I was playing minecraft with mods, and when i was creating an NPC with the mod CustomNPCs i selected the model "pixelmon" (the model that is used to select the model of a pokemon with the mod Pixelmon) and my game suddenly crashed, and every time i do it again it crashes,

The mods that i have are:
SecurityCraft-BetterFps-BiomesOPlenty-CarryOn-Chisel-CreativeCore-CustomNpcs-Decocraft-Emoticons-foamfix-GentleHarvest-Hwyla-ImmersiveCraft-InventoryTweaks-IronChest-JustEnoughItems-JourneyMap-MinecraftComesAlive-mcjtylib-mclib-Morpheus-OnlinePictureFrame-Optifine-PixelmonGenerations-PlayerRevive-PTRlib-SpartanShields-SpartanWeaponry-Rei´sTombstone-UTeamCore-UsefulBackpacks.

The Crash Report says:

---- Minecraft Crash Report ----

WARNING: coremods are present:
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.10-1.12.2.jar)
EarlyLoadPlugin (PixelmonGenerations-1.12.2-8.0.0-universal.jar)
CreativePatchingLoader (CreativeCore_v1.10.16_mc1.12.2.jar)
CTMCorePlugin (CTM-MC1.12.2-1.0.2.31.jar)
McLib core mod (mclib-1.0.4-1.12.2.jar)
Contact their authors BEFORE contacting forge

// Shall we play a game?

Time: 6/22/20 8:45 PM
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
at com.pixelmongenerations.common.entity.pixelmon.Entity4Textures.getSpecialTexture(Entity4Textures.java:160)
at com.pixelmongenerations.common.entity.pixelmon.Entity4Textures.getRealTexture(Entity4Textures.java:106)
at com.pixelmongenerations.common.entity.pixelmon.Entity4Textures.getTexture(Entity4Textures.java:90)
at com.pixelmongenerations.client.render.RenderPixelmon.getEntityTexture(RenderPixelmon.java:516)
at com.pixelmongenerations.client.render.RenderPixelmon.func_110775_a(RenderPixelmon.java:37)
at net.minecraft.client.renderer.entity.NPCRendererHelper.getTexture(NPCRendererHelper.java:15)
at noppes.npcs.client.gui.model.GuiCreationEntities.scrollClicked(GuiCreationEntities.java:110)
at noppes.npcs.client.gui.util.GuiCustomScroll.func_73864_a(GuiCustomScroll.java:223)
at noppes.npcs.client.gui.util.GuiNPCInterface.func_73864_a(GuiNPCInterface.java:149)
at noppes.npcs.client.gui.model.GuiCreationScreenInterface.func_73864_a(GuiCreationScreenInterface.java:123)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:533)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:501)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1759)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
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:497)
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.pixelmongenerations.common.entity.pixelmon.Entity4Textures.getSpecialTexture(Entity4Textures.java:160)
at com.pixelmongenerations.common.entity.pixelmon.Entity4Textures.getRealTexture(Entity4Textures.java:106)
at com.pixelmongenerations.common.entity.pixelmon.Entity4Textures.getTexture(Entity4Textures.java:90)
at com.pixelmongenerations.client.render.RenderPixelmon.getEntityTexture(RenderPixelmon.java:516)
at com.pixelmongenerations.client.render.RenderPixelmon.func_110775_a(RenderPixelmon.java:37)
at net.minecraft.client.renderer.entity.NPCRendererHelper.getTexture(NPCRendererHelper.java:15)
at noppes.npcs.client.gui.model.GuiCreationEntities.scrollClicked(GuiCreationEntities.java:110)
at noppes.npcs.client.gui.util.GuiCustomScroll.func_73864_a(GuiCustomScroll.java:223)
at noppes.npcs.client.gui.util.GuiNPCInterface.func_73864_a(GuiNPCInterface.java:149)
at noppes.npcs.client.gui.model.GuiCreationScreenInterface.func_73864_a(GuiCreationScreenInterface.java:123)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:533)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:501)

– Affected screen –
Details:
Screen name: noppes.npcs.client.gui.model.GuiCreationEntities

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['Klaklot13'/47, l='MpServer', x=913.08, y=69.00, z=1217.10]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 2456343 game time, 264863 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 42 total; [EntityPlayerSP['Klaklot13'/47, l='MpServer', x=913.57, y=69.00, z=1216.52], EntityPixelmon['Klink'/128, l='MpServer', x=937.80, y=72.00, z=1205.48], EntityPixelmon['Graveler'/129, l='MpServer', x=935.00, y=71.00, z=1189.91], EntityPixelmon['Grubbin'/66, l='MpServer', x=879.91, y=88.00, z=1240.64], EntityPixelmon['Timburr'/67, l='MpServer', x=896.51, y=73.00, z=1214.50], EntityPlayerSP['Klaklot13'/47, l='MpServer', x=913.08, y=69.00, z=1217.10], EntityPixelmon['Aron'/137, l='MpServer', x=931.51, y=68.90, z=1214.50], EntityPixelmon['Rhyhorn'/74, l='MpServer', x=880.79, y=66.00, z=1228.83], EntityPixelmon['Timburr'/139, l='MpServer', x=935.33, y=70.00, z=1191.60], EntityPixelmon['Machop'/76, l='MpServer', x=888.99, y=97.00, z=1216.82], EntityPixelmon['Nosepass'/77, l='MpServer', x=895.74, y=91.00, z=1201.85], EntityPixelmon['Aron'/141, l='MpServer', x=897.80, y=77.00, z=1233.50], EntityPixelmon['Lotad'/78, l='MpServer', x=926.50, y=76.00, z=1221.07], EntityPixelmon['Woobat'/142, l='MpServer', x=901.27, y=73.00, z=1224.50], EntityPixelmon['Timburr'/143, l='MpServer', x=895.38, y=79.05, z=1231.16], EntityPixelmon['Mankey'/145, l='MpServer', x=919.50, y=87.00, z=1186.80], EntityPixelmon['Patrat'/82, l='MpServer', x=930.33, y=80.00, z=1206.68], EntityPixelmon['Patrat'/83, l='MpServer', x=922.42, y=92.00, z=1198.64], EntityPixelmon['Woobat'/84, l='MpServer', x=878.59, y=102.00, z=1207.57], EntityPixelmon['Graveler'/148, l='MpServer', x=919.50, y=90.00, z=1195.50], EntityPixelmon['Joltik'/85, l='MpServer', x=932.45, y=69.07, z=1212.50], EntityPixelmon['Noibat'/149, l='MpServer', x=918.50, y=85.00, z=1181.15], EntityPixelmon['Woobat'/89, l='MpServer', x=885.50, y=100.00, z=1221.27], EntityPixelmon['Psyduck'/153, l='MpServer', x=949.32, y=75.00, z=1218.50], EntityPixelmon['Whismur'/90, l='MpServer', x=916.43, y=56.00, z=1211.52], EntityPixelmon['Klink'/154, l='MpServer', x=884.12, y=100.04, z=1219.48], EntityPixelmon['Nosepass'/91, l='MpServer', x=923.96, y=88.00, z=1186.94], EntityPixelmon['Drilbur'/155, l='MpServer', x=918.80, y=70.03, z=1229.81], EntityPixelmon['Klink'/92, l='MpServer', x=937.43, y=75.00, z=1186.39], EntityPixelmon['Psyduck'/156, l='MpServer', x=892.32, y=62.00, z=1250.50], EntityPixelmon['Meditite'/157, l='MpServer', x=952.60, y=74.00, z=1227.50], EntityPixelmon['Whismur'/158, l='MpServer', x=901.45, y=72.00, z=1215.50], EntityPixelmon['Nosepass'/95, l='MpServer', x=893.39, y=62.00, z=1186.88], EntityPixelmon['Lairon'/159, l='MpServer', x=885.53, y=74.00, z=1230.28], EntityPixelmon['Whismur'/100, l='MpServer', x=904.43, y=72.00, z=1225.53], EntityPixelmon['Corphish'/102, l='MpServer', x=906.80, y=82.00, z=1214.48], EntityPixelmon['Nosepass'/103, l='MpServer', x=897.78, y=78.00, z=1233.84], EntityPixelmon['Drilbur'/106, l='MpServer', x=870.56, y=68.00, z=1226.49], EntityCustomNpc['...'/48, l='MpServer', x=911.50, y=69.00, z=1216.50], EntityPixelmon['Klink'/112, l='MpServer', x=939.30, y=69.00, z=1211.50], EntityPixelmon['Lombre'/113, l='MpServer', x=929.49, y=68.34, z=1215.49], EntityPixelmon['Vaporeon'/118, l='MpServer', x=899.00, y=78.00, z=1235.20]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:532)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2741)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:419)
at net.minecraft.client.main.Main.main(SourceFile:123)
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:497)
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 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 433590120 bytes (413 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.5.2847 Optifine OptiFine_1.12.2_HD_U_F5 38 mods loaded, 37 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

Loaded coremods (and transformers):
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
invtweaks.forge.asm.ContainerTransformer
Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.10-1.12.2.jar)
pl.asie.foamfix.coremod.FoamFixTransformer
EarlyLoadPlugin (PixelmonGenerations-1.12.2-8.0.0-universal.jar)
com.pixelmongenerations.core.plugin.PixelmonTransformer
CreativePatchingLoader (CreativeCore_v1.10.16_mc1.12.2.jar)

CTMCorePlugin (CTM-MC1.12.2-1.0.2.31.jar)
team.chisel.ctm.client.asm.CTMTransformer
McLib core mod (mclib-1.0.4-1.12.2.jar)
mchorse.mclib.core.McLibCMClassTransformer
Launched Version: 1.12.2-forge1.12.2-14.23.5.2847
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.5129, 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: vanilla
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
OptiFine Version: OptiFine_1.12.2_HD_U_F5
OptiFine Build: 20191204-141934
Render Distance Chunks: 3
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: (internal)
OpenGlVersion: 4.0.0 - Build 10.18.10.5129
OpenGlRenderer: Intel(R) HD Graphics 4000
OpenGlVendor: Intel
CpuCount: 8

Anyone knows how to fix it?