Unable to launch OptiFine 1.18

[H4kt]

Version json: https://www.toptal.com/developers/hastebin/efedakeqes.json Note: I changed invalid OptiFine libraries' links to valid ones from our custom server.

Options:

const otps: ILauncherOptions = {
  root: <root path>,
  version: {
    custom: "OptiFine 1.18"
  },
  authorization: getAuth(),
  memory: {
    min: "4G",
    max: "6G"
  }
};

const getAuth = async (): Promise<IUser> => {
 return {
   access_token: '',
   client_token: '',
   uuid: 'e63d3652-1822-4986-9e87-344f4d340878',
   name: 'H4kt',
   user_properties: undefined,
   meta: {
     type: 'msa',
     demo: false,
   }
 }
}

Error log:

[MCLC]: MCLC version 3.16.13
[MCLC]: Using Java version 17.0.3.1 64-bit
[MCLC]: Downloaded and extracted natives
[MCLC]: Set native path to C:\Users\H4kt\Desktop\test\natives\1.18
[MCLC]: Detected custom in options, setting custom version file
[MCLC]: Collected class paths
[MCLC]: Using ; to separate class paths
[MCLC]: Attempting to download assets
[MCLC]: Downloaded assets
[MCLC]: Set launch options
[MCLC]: Launching with arguments -XX:-UseAdaptiveSizePolicy -XX:-OmitStackTraceInFastThrow -Dfml.ignorePatchDiscrepancies=true -Dfml.ignoreInvalidMinecraftCertificates=true -Djava.library
.path=C:\Users\H4kt\Desktop\test\natives\1.18 -Xmx6G -Xms4G -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -cp C:\Users\H4kt\Desktop\test\librari
es\com\mojang\blocklist\1.0.6\blocklist-1.0.6.jar;C:\Users\H4kt\Desktop\test\libraries\com\mojang\patchy\2.1.6\patchy-2.1.6.jar;C:\Users\H4kt\Desktop\test\libraries\optifine\launchwrapper
\2.3\launchwrapper-2.3.jar;C:\Users\H4kt\Desktop\test\libraries\com\github\oshi\oshi-core\5.8.2\oshi-core-5.8.2.jar;C:\Users\H4kt\Desktop\test\libraries\net\java\dev\jna\jna\5.9.0\jna-5.9
.0.jar;C:\Users\H4kt\Desktop\test\libraries\net\java\dev\jna\jna-platform\5.9.0\jna-platform-5.9.0.jar;C:\Users\H4kt\Desktop\test\libraries\org\slf4j\slf4j-api\1.8.0-beta4\slf4j-api-1.8.0
-beta4.jar;C:\Users\H4kt\Desktop\test\libraries\org\apache\logging\log4j\log4j-slf4j18-impl\2.14.1\log4j-slf4j18-impl-2.14.1.jar;C:\Users\H4kt\Desktop\test\libraries\com\mojang\javabridge
\1.2.24\javabridge-1.2.24.jar;C:\Users\H4kt\Desktop\test\libraries\optifine\OptiFine\1.18_HD_U_H3\OptiFine-1.18_HD_U_H3.jar;C:\Users\H4kt\Desktop\test\libraries\net\sf\jopt-simple\jopt-si
mple\5.0.4\jopt-simple-5.0.4.jar;C:\Users\H4kt\Desktop\test\libraries\io\netty\netty-all\4.1.68.Final\netty-all-4.1.68.Final.jar;C:\Users\H4kt\Desktop\test\libraries\com\ibm\icu\icu4j\69.
1\icu4j-69.1.jar;C:\Users\H4kt\Desktop\test\libraries\com\google\guava\failureaccess\1.0.1\failureaccess-1.0.1.jar;C:\Users\H4kt\Desktop\test\libraries\org\apache\commons\commons-lang3\3.
12.0\commons-lang3-3.12.0.jar;C:\Users\H4kt\Desktop\test\libraries\com\google\guava\guava\31.0.1-jre\guava-31.0.1-jre.jar;C:\Users\H4kt\Desktop\test\libraries\commons-io\commons-io\2.11.0
\commons-io-2.11.0.jar;C:\Users\H4kt\Desktop\test\libraries\commons-codec\commons-codec\1.15\commons-codec-1.15.jar;C:\Users\H4kt\Desktop\test\libraries\com\mojang\brigadier\1.0.18\brigad
ier-1.0.18.jar;C:\Users\H4kt\Desktop\test\libraries\com\mojang\datafixerupper\4.0.26\datafixerupper-4.0.26.jar;C:\Users\H4kt\Desktop\test\libraries\com\google\code\gson\gson\2.8.8\gson-2.
8.8.jar;C:\Users\H4kt\Desktop\test\libraries\com\mojang\authlib\3.2.38\authlib-3.2.38.jar;C:\Users\H4kt\Desktop\test\libraries\org\apache\commons\commons-compress\1.21\commons-compress-1.
21.jar;C:\Users\H4kt\Desktop\test\libraries\org\apache\httpcomponents\httpclient\4.5.13\httpclient-4.5.13.jar;C:\Users\H4kt\Desktop\test\libraries\commons-logging\commons-logging\1.2\comm
ons-logging-1.2.jar;C:\Users\H4kt\Desktop\test\libraries\org\apache\httpcomponents\httpcore\4.4.14\httpcore-4.4.14.jar;C:\Users\H4kt\Desktop\test\libraries\org\apache\logging\log4j\log4j-
api\2.14.1\log4j-api-2.14.1.jar;C:\Users\H4kt\Desktop\test\libraries\org\apache\logging\log4j\log4j-core\2.14.1\log4j-core-2.14.1.jar;C:\Users\H4kt\Desktop\test\libraries\org\lwjgl\lwjgl\
3.2.2\lwjgl-3.2.2.jar;C:\Users\H4kt\Desktop\test\libraries\org\lwjgl\lwjgl-jemalloc\3.2.2\lwjgl-jemalloc-3.2.2.jar;C:\Users\H4kt\Desktop\test\libraries\org\lwjgl\lwjgl-openal\3.2.2\lwjgl-
openal-3.2.2.jar;C:\Users\H4kt\Desktop\test\libraries\org\lwjgl\lwjgl-opengl\3.2.2\lwjgl-opengl-3.2.2.jar;C:\Users\H4kt\Desktop\test\libraries\org\lwjgl\lwjgl-glfw\3.2.2\lwjgl-glfw-3.2.2.
jar;C:\Users\H4kt\Desktop\test\libraries\org\lwjgl\lwjgl-stb\3.2.2\lwjgl-stb-3.2.2.jar;C:\Users\H4kt\Desktop\test\libraries\org\lwjgl\lwjgl-tinyfd\3.2.2\lwjgl-tinyfd-3.2.2.jar;C:\Users\H4
kt\Desktop\test\libraries\it\unimi\dsi\fastutil\8.5.6\fastutil-8.5.6.jar;C:\Users\H4kt\Desktop\test\libraries\com\mojang\text2speech\1.11.3\text2speech-1.11.3.jar;C:\Users\H4kt\Desktop\te
st\versions\OptiFine 1.18\OptiFine 1.18.jar net.minecraft.launchwrapper.Launch --username H4kt --version 1.18 --gameDir C:\Users\H4kt\Desktop\test --assetsDir C:\Users\H4kt\Desktop\test\assets --assetIndex 1.18 --uuid e63d3652-1822-4986-9e87-344f4d340878 --accessToken  --clientId  --xuid  --userType msa --versionType release
Launched game in 0.73695 min
[02:27:01] [main/INFO]: Loading tweak class name net.minecraft.launchwrapper.VanillaTweaker

[02:27:01] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraft.launchwrapper.VanillaTweaker
        at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?]
        at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188) ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
        at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:104) ~[launchwrapper-2.3.jar:2.3]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:587) ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
        at java.lang.Class.forName0(Native Method) ~[?:?]
        at java.lang.Class.forName(Class.java:467) ~[?:?]
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:122) [launchwrapper-2.3.jar:2.3]
        at net.minecraft.launchwrapper.Launch.main(Launch.java:30) [launchwrapper-2.3.jar:2.3]

[AarushX]

A quick google search finds this Minecraft Forum that says your MC files have been corrupted. I suggest checking that

1. "Optifine 1.18.jar" exists
2. Your custom server libraries are being served
3. Check out this issue and try out different Java versions
4. Make sure you have added these arguments to your JSON
5. If all else fails (specifically 3 and 4) try this json file out.

Good luck!

[H4kt]

Mojang launcher seems to have no issues when launching it

[AarushX]

I think Mojang's Launcher has a few automatic features that you need to do here manually. Have you tried 4?

[H4kt]

They are indeed in the json file I've attached

[AarushX]

Honestly from what I can tell you should be fine. The issue could be with the folder you're launching from (it could be downloading the assets to a different folder?)

[H4kt]

Bruh like a you serious? The JSON file is completely fine cuz it was tested on Mojang's launcher. Your library is definitely working incorrectly in that case.

[Pierce01]

Hey there H4kt, I'll take a look into why MCLC isn't launching with your specified launch options. I apologize for the delay in response, it's been a busy week.

Aarush, I appreciate you trying to help, but if you don't know what the issue is and are unwilling to test it, please don't continue to provide solutions as it's just going to cause confusion to others reading this thread.

[Pierce01]

Hey H4kt, would you be able to join the Discord and shoot me a message? I'd like to collect more information so I can work on this issue.

If you don't want to join the discord, my tag is Pierce#2657.