I'm working on Minecraft. 
Reported expansion through!
I have an up and down. Is there any way to fix it?
It's a code.
https://github.com/bangsejun/1.15.2-

1 minute ago, diesieben07 said:

Please post the log.

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 20. 11. 4 오후 8:29
Description: Rendering screen

java.lang.NullPointerException: Registry Object not present: frost:froze
    at java.util.Objects.requireNonNull(Objects.java:290) ~[?:1.8.0_261] {}
    at net.minecraftforge.fml.RegistryObject.get(RegistryObject.java:120) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading}
    at com.coldbreath.frost.Frost$1.createIcon(Frost.java:33) ~[main/:?] {re:classloading}
    at net.minecraft.item.ItemGroup.getIcon(ItemGroup.java:139) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.client.gui.screen.inventory.CreativeScreen.drawTab(CreativeScreen.java:820) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.inventory.CreativeScreen.drawGuiContainerBackgroundLayer(CreativeScreen.java:705) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.inventory.ContainerScreen.render(ContainerScreen.java:75) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.DisplayEffectsScreen.render(DisplayEffectsScreen.java:45) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.gui.screen.inventory.CreativeScreen.render(CreativeScreen.java:605) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:368) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading}
    at net.minecraft.client.renderer.GameRenderer.updateCameraAndRender(GameRenderer.java:480) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:924) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.run(Minecraft.java:553) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:177) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_261] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_261] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_261] {}
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_261] {}
    at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) ~[forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.1.2.jar:?] {}
    at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:105) [forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar:?] {}

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

-- Head --
Thread: Render thread
Stacktrace:
    at java.util.Objects.requireNonNull(Objects.java:290)
    at net.minecraftforge.fml.RegistryObject.get(RegistryObject.java:120)
    at com.coldbreath.frost.Frost$1.createIcon(Frost.java:33)
    at net.minecraft.item.ItemGroup.getIcon(ItemGroup.java:139)
    at net.minecraft.client.gui.screen.inventory.CreativeScreen.drawTab(CreativeScreen.java:820)
    at net.minecraft.client.gui.screen.inventory.CreativeScreen.drawGuiContainerBackgroundLayer(CreativeScreen.java:705)
    at net.minecraft.client.gui.screen.inventory.ContainerScreen.render(ContainerScreen.java:75)
    at net.minecraft.client.gui.DisplayEffectsScreen.render(DisplayEffectsScreen.java:45)
    at net.minecraft.client.gui.screen.inventory.CreativeScreen.render(CreativeScreen.java:605)
    at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:368)

-- Screen render details --
Details:
    Screen name: net.minecraft.client.gui.screen.inventory.CreativeScreen
    Mouse location: Scaled: (295, 6). Absolute: (591.000000, 12.000000)
    Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2.000000

-- Affected level --
Details:
    All players: 1 total; [ClientPlayerEntity['Dev'/375, l='MpServer', x=-116.61, y=110.25, z=242.66]]
    Chunk stats: Client Chunk Cache: 841, 572
    Level dimension: DimensionType{minecraft:overworld}
    Level name: MpServer
    Level seed: -7638251618224749452
    Level generator: ID 00 - default, ver 1. Features enabled: false
    Level generator options: {}
    Level spawn location: World: (-64,74,224), Chunk: (at 0,4,0 in -4,14; contains blocks -64,0,224 to -49,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
    Level time: 471 game time, 471 day time
    Known server brands: 
    Level was modded: false
    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
    Server brand: forge
    Server type: Integrated singleplayer server
Stacktrace:
    at net.minecraft.client.world.ClientWorld.fillCrashReport(ClientWorld.java:442)
    at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:1763)
    at net.minecraft.client.Minecraft.run(Minecraft.java:567)
    at net.minecraft.client.main.Main.main(Main.java:177)
    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.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55)
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)
    at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:105)

-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_261, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 882171928 bytes (841 MB) / 3219128320 bytes (3070 MB) up to 5726797824 bytes (5461 MB)
    CPUs: 12
    JVM Flags: 2 total; -Xmx6G -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
    ModLauncher: 5.1.2+70+master.2845bb9
    ModLauncher launch target: fmluserdevclient
    ModLauncher naming: mcp
    ModLauncher services: 
        /mixin-0.8.2.jar mixin PLUGINSERVICE 
        /eventbus-2.2.0-service.jar eventbus PLUGINSERVICE 
        /forge-1.15.2-31.2.45_mapped_stable_60-1.15-launcher.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.15.2-31.2.45_mapped_stable_60-1.15-launcher.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-2.1.3-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.15.2-31.2.45_mapped_stable_60-1.15-launcher.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.15.2-31.2.45_mapped_stable_60-1.15-launcher.jar runtimedistcleaner PLUGINSERVICE 
        /mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE 
        /forge-1.15.2-31.2.45_mapped_stable_60-1.15-launcher.jar fml TRANSFORMATIONSERVICE 
    FML: 31.2
    Forge: net.minecraftforge:31.2.45
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        client-extra.jar Minecraft {[email protected] DONE}
        main Frost {frost@$1.15.2-1.0.0 DONE}
        forge-1.15.2-31.2.45_mapped_stable_60-1.15-recomp.jar Forge {[email protected] DONE}
    Launched Version: MOD_DEV
    Backend library: LWJGL version 3.2.2 build 10
    Backend API: GeForce RTX 2060/PCIe/SSE2 GL version 4.6.0 NVIDIA 456.71, NVIDIA Corporation
    GL Caps: Using framebuffer using OpenGL 3.0
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'forge'
    Type: Client (map_client.txt)
    Resource Packs: 
    Current Language: 한국어 (대한민국)
    CPU: 12x Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz

 

17 minutes ago, diesieben07 said:

You never register your DeferredRegister instances to the mod event bus.

감사합니다!