为什么在更改“ MC_VERSION”变量的值时不能启动Minecraft mod？

编程问答 2022-06-03

问题描述

当我尝试启动我的minecraft Mod时，它说“启动runclient遇到问题。 引用未定义的变量MC_VERSION。”

我正在使用伪造14.23.5.285在1.12.2中制作我的mod

当我尝试将变量“ MC_VERSION”的值设置为value =“ 1.12.2”时，我就这样说。

Picked up _JAVA_OPTIONS: -Xmx512M
[2020-11-06 21:27:56] [INFO   ] Natives: C:\Users\User\Desktop\Zeldryx Mod\build\natives 
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by net.minecraftforge.legacydev.MainClient (file:/C:/Users/User/.gradle/caches/modules-2/files-2.1/net.minecraftforge/legacydev/0.2.3.1/f2cd4a8c9f09faf1c1e4a9a4c65df36e634f95db/legacydev-0.2.3.1-fatjar.jar) to method java.lang.classLoader.initializePath(java.lang.String)
WARNING: Please consider reporting this to the maintainers of net.minecraftforge.legacydev.MainClient
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[2020-11-06 21:27:56] [INFO   ] Main Class: net.minecraft.launchwrapper.Launch 
[2020-11-06 21:27:56] [INFO   ] Srg2Mcp: C:\Users\User\Desktop\Zeldryx Mod\build\createSrgToMcp\output.srg 
[2020-11-06 21:27:56] [INFO   ] Extra: [] 
[2020-11-06 21:27:56] [INFO   ] Running with arguments: [--version,1.12.2,--assetIndex,1.12,--assetsDir,C:\Users\User\.gradle\caches\forge_gradle\assets,--accesstoken,{REDACTED},--userProperties,[],--tweakClass,net.minecraftforge.fml.common.launcher.FMLTweaker] 
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at net.minecraftforge.legacydev.Main.start(Main.java:86)
    at net.minecraftforge.legacydev.MainClient.main(MainClient.java:29)
Caused by: java.lang.classCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.urlclassloader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.urlclassloader are in module java.base of loader 'bootstrap')
    at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    ... 6 more

解决方法

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