Game whilst rendering item

Everytime I try to go in the mod tab, it crashes (I have Vic's modern Warfare and Custom Npc in the great version) : here is the full thing

---- Minecraft Crash Report ----

WARNING: coremods are present:
  weaponlib (mw_2.0-0.4.4.6_mc1.12.2.jar)
Contact their authors BEFORE contacting forge

// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 7/17/21 11:25 AM
Description: Rendering item

java.lang.IllegalStateException: Not building!
    at net.minecraft.client.renderer.BufferBuilder.func_178977_d(BufferBuilder.java:537)
    at net.minecraft.client.renderer.Tessellator.func_78381_a(SourceFile:21)
    at com.vicmatskiv.weaponlib.compatibility.CompatibleWeaponRenderer.func_188616_a(CompatibleWeaponRenderer.java:144)
    at net.minecraftforge.client.ForgeHooksClient.renderLitItem(ForgeHooksClient.java:653)
    at net.minecraft.client.renderer.RenderItem.func_191967_a(RenderItem.java:118)
    at net.minecraft.client.renderer.RenderItem.func_191961_a(RenderItem.java:106)
    at net.minecraft.client.renderer.RenderItem.func_180454_a(RenderItem.java:149)
    at net.minecraft.client.renderer.RenderItem.func_191962_a(RenderItem.java:308)
    at net.minecraft.client.renderer.RenderItem.func_184391_a(RenderItem.java:347)
    at net.minecraft.client.renderer.RenderItem.func_180450_b(RenderItem.java:336)
    at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147051_a(GuiContainerCreative.java:922)
    at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146976_a(GuiContainerCreative.java:758)
    at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:75)
    at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
    at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:643)
    at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:396)
    at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1124)
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
    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 net.minecraft.client.renderer.BufferBuilder.func_178977_d(BufferBuilder.java:537)
    at net.minecraft.client.renderer.Tessellator.func_78381_a(SourceFile:21)
    at com.vicmatskiv.weaponlib.compatibility.CompatibleWeaponRenderer.func_188616_a(CompatibleWeaponRenderer.java:144)
    at net.minecraftforge.client.ForgeHooksClient.renderLitItem(ForgeHooksClient.java:653)
    at net.minecraft.client.renderer.RenderItem.func_191967_a(RenderItem.java:118)
    at net.minecraft.client.renderer.RenderItem.func_191961_a(RenderItem.java:106)
    at net.minecraft.client.renderer.RenderItem.func_180454_a(RenderItem.java:149)
    at net.minecraft.client.renderer.RenderItem.func_191962_a(RenderItem.java:308)

-- Item being rendered --
Details:
    Item Type: com.vicmatskiv.weaponlib.Weapon@6fb527b4
    Registry Name: mw:m16a4
    Item Aux: 0
    Item NBT: null
    Item Foil: false
Stacktrace:
    at net.minecraft.client.renderer.RenderItem.func_184391_a(RenderItem.java:347)
    at net.minecraft.client.renderer.RenderItem.func_180450_b(RenderItem.java:336)
    at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147051_a(GuiContainerCreative.java:922)
    at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146976_a(GuiContainerCreative.java:758)
    at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:75)
    at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(InventoryEffectRenderer.java:51)
    at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:643)
    at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:396)

-- Screen render details --
Details:
    Screen name: net.minecraft.client.gui.inventory.GuiContainerCreative
    Mouse location: Scaled: (322, 16). Absolute: (1291, 934)
    Screen size: Scaled: (480, 251). Absolute: (1920, 1001). Scale factor of 4

-- Affected level --
Details:
    Level name: MpServer
    All players: 1 total; [EntityPlayerSP['Pro_the_stuff'/1717, l='MpServer', x=-56.50, y=64.00, z=253.50]]
    Chunk stats: MultiplayerChunkCache: 49, 49
    Level seed: 0
    Level generator: ID 00 - default, ver 1. Features enabled: false
    Level generator options: 
    Level spawn location: World: (-60,64,252), Chunk: (at 4,4,12 in -4,15; contains blocks -64,0,240 to -49,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
    Level time: 134 game time, 134 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: 4 total; [EntityPlayerSP['Pro_the_stuff'/1717, l='MpServer', x=-56.50, y=64.00, z=253.50], EntityBat['Bat'/3207, l='MpServer', x=-48.43, y=17.87, z=248.37], EntityBat['Bat'/3283, l='MpServer', x=-55.46, y=39.10, z=255.25], EntityBat['Bat'/3284, l='MpServer', x=-53.49, y=38.00, z=255.25]]
    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:420)
    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: 1112618448 bytes (1061 MB) / 1912602624 bytes (1824 MB) up to 3221225472 bytes (3072 MB)
    JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    IntCache: cache: 7, tcache: 0, allocated: 12, tallocated: 94
    FML: MCP 9.42 Powered by Forge 14.23.5.2854 7 mods loaded, 7 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

    | State  | ID             | Version      | Source                                | Signature                                |
    |:------ |:-------------- |:------------ |:------------------------------------- |:---------------------------------------- |
    | LCHIJA | minecraft      | 1.12.2       | minecraft.jar                         | None                                     |
    | LCHIJA | mcp            | 9.42         | minecraft.jar                         | None                                     |
    | LCHIJA | FML            | 8.0.99.99    | forge-1.12.2-14.23.5.2854.jar         | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | LCHIJA | forge          | 14.23.5.2854 | forge-1.12.2-14.23.5.2854.jar         | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | LCHIJA | craftstudioapi | 1.0.0        | CraftStudio-1.0.0.93-mc1.12-alpha.jar | None                                     |
    | LCHIJA | customnpcs     | 1.12         | CustomNPCs_1.12.2-(05Jul20).jar       | None                                     |
    | LCHIJA | mw             | 0.4.4.6      | mw_2.0-0.4.4.6_mc1.12.2.jar           | None                                     |

    Loaded coremods (and transformers): 
weaponlib (mw_2.0-0.4.4.6_mc1.12.2.jar)
  com.vicmatskiv.weaponlib.core.WeaponlibClassTransformer
    GL info: ' Vendor: 'Intel' Version: '4.6.0 - Build 26.20.100.6813' Renderer: 'Intel(R) HD Graphics 500'
    Launched Version: 1.12.2-forge-14.23.5.2854
    LWJGL: 2.9.4
    OpenGL: Intel(R) HD Graphics 500 GL version 4.6.0 - Build 26.20.100.6813, 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: Simple PVP.zip
    Current Language: English (US)
    Profiler Position: N/A (disabled)
    CPU: 4x Intel(R) Celeron(R) CPU J3455 @ 1.50GHz