我的世界ForgeMDK找不到资源文件

这是启动控制台输出

[14:17:32] [Client thread/ERROR] [minecraft/ResourceIndex]: **Can't find the resource index file: assets\indexes\1.12.json**
[14:17:32] [Client thread/INFO] [minecraft/Minecraft]: Setting user: Player325
[14:17:34] [Client thread/INFO] [minecraft/Minecraft]: LWJGL Version: 2.9.4
---- Minecraft Crash Report ----
// Why did you do that?

Time: 8/15/21 2:17 PM
Description: Initializing game

java.lang.ExceptionInInitializerError
    at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:217)
    at net.minecraft.client.Minecraft.init(Minecraft.java:467)
    at net.minecraft.client.Minecraft.run(Minecraft.java:378)
    at net.minecraft.client.main.Main.main(Main.java:118)
    at mcp.client.Start.main(Start.java:13)
Caused by: java.lang.NullPointerException
    at net.minecraftforge.fml.client.SplashProgress.createResourcePack(SplashProgress.java:731)
    at net.minecraftforge.fml.client.SplashProgress.<clinit>(SplashProgress.java:99)
    ... 5 more


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

-- Head --
Thread: Client thread
Stacktrace:
    at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:217)
    at net.minecraft.client.Minecraft.init(Minecraft.java:467)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.Minecraft.run(Minecraft.java:378)
    at net.minecraft.client.main.Main.main(Main.java:118)
    at mcp.client.Start.main(Start.java:13)

-- System Details --
Details:
    Minecraft Version: 1.12.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_301, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 185277808 bytes (176 MB) / 250085376 bytes (238 MB) up to 3779067904 bytes (3604 MB)
    JVM Flags: 0 total; 
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: 
    Loaded coremods (and transformers): 
    Launched Version: mcp
    LWJGL: 2.9.4
    OpenGL: GeForce MX250/PCIe/SSE2 GL version 4.6.0 NVIDIA 442.50, NVIDIA Corporation
    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: ~~ERROR~~ NullPointerException: null
    Profiler Position: N/A (disabled)
    CPU: 8x Intel(R) Core(TM) i7-10510U CPU @ 1.80GHz
#@!@# Game crashed! Crash report saved to: #@!@# E:\JAVAProject\ModTest\.\crash-reports\crash-2021-08-15_14.17.35-client.txt

重装好几次都是这样:Can't find the resource index file: assets\indexes\1.12.json
看了日志后又不知道具体怎么修!