I have been developing my mod for a while and decided to add a Gradle nature to it and port it back to 1.11.2 (from 1.12.2), but ever since then, whenever I try to launch it, it cannot find the method Preconditions#checkNonNull on 1.12 and CharMatcher#JAVA_LETTER_OR_DIGIT on 1.11, I have tried creating a new project, I have tried numerous times to setup the decomp workspace again, I've tried just removing the Gradle nature, I've tried deleting the cache. Nothing works.

1.11 log:

2019-05-07 18:43:49,689 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2019-05-07 18:43:49,691 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[18:43:49] [main/INFO] [GradleStart]: Extra: []
[18:43:49] [main/INFO] [GradleStart]: Running with arguments: [--userProperties, {}, --assetsDir, C:/Users/PlanetTeamSpeak/.gradle/caches/minecraft/assets, --assetIndex, 1.11, --accessToken{REDACTED}, --version, 1.11.2, --tweakClass, net.minecraftforge.fml.common.launcher.FMLTweaker, --tweakClass, net.minecraftforge.gradle.tweakers.CoremodTweaker]
[18:43:49] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.CoremodTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[18:43:49] [main/INFO] [FML]: Forge Mod Loader version 13.20.1.2386 for Minecraft 1.11.2 loading
[18:43:49] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_202, running on Windows 10:amd64:10.0, installed at A:\Program Files\Java\jdk1.8.0_202\jre
[18:43:49] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[18:43:49] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.CoremodTweaker
[18:43:49] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.fml.relauncher.FMLCorePlugin
[18:43:49] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.classloading.FMLForgePlugin
[18:43:49] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:43:49] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
2019-05-07 18:43:50,223 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2019-05-07 18:43:50,264 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2019-05-07 18:43:50,265 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[18:43:50] [main/ERROR] [FML]: The binary patch set is missing. Either you are in a development environment, or things are not going to work!
[18:43:51] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing
[18:43:51] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[18:43:51] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[18:43:52] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[18:43:52] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[18:43:52] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[18:43:52] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[18:43:52] [Client thread/INFO]: Setting user: Player503
[18:43:57] [Client thread/INFO]: LWJGL Version: 2.9.4
[18:44:00] [Client thread/INFO] [FML]: Could not load splash.properties, will create a default one
[18:44:00] [Client thread/INFO] [FML]: -- System Details --
Details:
	Minecraft Version: 1.11.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_202, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 827619704 bytes (789 MB) / 1161297920 bytes (1107 MB) up to 3799515136 bytes (3623 MB)
	JVM Flags: 0 total; 
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: 
	Loaded coremods (and transformers): 
	GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 430.35' Renderer: 'GeForce GTX 1060 6GB/PCIe/SSE2'
[18:44:00] [Client thread/INFO] [FML]: MinecraftForge v13.20.1.2386 Initialized
[18:44:00] [Client thread/INFO] [FML]: Replaced 232 ore recipes
[18:44:00] [Client thread/INFO]: Reloading ResourceManager: Default
[18:44:01] [Client thread/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:600]: ---- Minecraft Crash Report ----
// There are four lights!

Time: 5/7/19 6:44 PM
Description: Initializing game

java.lang.NoSuchFieldError: JAVA_LETTER_OR_DIGIT
	at net.minecraftforge.common.config.Configuration.<clinit>(Configuration.java:83)
	at net.minecraftforge.common.ForgeModContainer.<init>(ForgeModContainer.java:157)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.lang.Class.newInstance(Class.java:442)
	at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:390)
	at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:554)
	at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:233)
	at net.minecraft.client.Minecraft.init(Minecraft.java:478)
	at net.minecraft.client.Minecraft.run(Minecraft.java:387)
	at net.minecraft.client.main.Main.main(Main.java:118)
	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.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	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.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)


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

-- Head --
Thread: Client thread
Stacktrace:
	at net.minecraftforge.common.config.Configuration.<clinit>(Configuration.java:83)
	at net.minecraftforge.common.ForgeModContainer.<init>(ForgeModContainer.java:157)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.lang.Class.newInstance(Class.java:442)
	at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:390)
	at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:554)
	at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:233)
	at net.minecraft.client.Minecraft.init(Minecraft.java:478)

-- Initialization --
Details:
Stacktrace:
	at net.minecraft.client.Minecraft.run(Minecraft.java:387)
	at net.minecraft.client.main.Main.main(Main.java:118)
	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.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	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.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)

-- System Details --
Details:
	Minecraft Version: 1.11.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_202, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 721224664 bytes (687 MB) / 1161297920 bytes (1107 MB) up to 3799515136 bytes (3623 MB)
	JVM Flags: 0 total; 
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.38 Powered by Forge 13.20.1.2386 3 mods loaded, 0 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
		minecraft{1.11.2} [Minecraft] (minecraft.jar) 
		mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
		FML{8.0.99.99} [Forge Mod Loader] (forgeSrc-1.11.2-13.20.1.2386.jar) 
	Loaded coremods (and transformers): 
	GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 430.35' Renderer: 'GeForce GTX 1060 6GB/PCIe/SSE2'
	Launched Version: 1.11.2
	LWJGL: 2.9.4
	OpenGL: GeForce GTX 1060 6GB/PCIe/SSE2 GL version 4.6.0 NVIDIA 430.35, 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: English (US)
	Profiler Position: N/A (disabled)
	CPU: 6x Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
[18:44:01] [Client thread/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:600]: #@!@# Game crashed! Crash report saved to: #@!@# M:\EclipseWorkspace\MoreCommands 1.11\run\.\crash-reports\crash-2019-05-07_18.44.01-client.txt

1.12 log:

[18:48:44] [main/INFO] [GradleStart]: Extra: []
[18:48:44] [main/INFO] [GradleStart]: Running with arguments: [--userProperties, {}, --assetsDir, C:/Users/PlanetTeamSpeak/.gradle/caches/minecraft/assets, --assetIndex, 1.12, --accessToken{REDACTED}, --version, 1.12.2, --tweakClass, net.minecraftforge.fml.common.launcher.FMLTweaker, --tweakClass, net.minecraftforge.gradle.tweakers.CoremodTweaker]
[18:48:44] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[18:48:44] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[18:48:44] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.CoremodTweaker
[18:48:44] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[18:48:44] [main/INFO] [FML]: Forge Mod Loader version 14.23.5.2768 for Minecraft 1.12.2 loading
[18:48:44] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_202, running on Windows 10:amd64:10.0, installed at A:\Program Files\Java\jdk1.8.0_202\jre
[18:48:45] [main/ERROR] [FML]: Apache Maven library folder was not in the format expected. Using default libraries directory.
[18:48:45] [main/ERROR] [FML]: Full: C:\Users\PlanetTeamSpeak\.gradle\caches\modules-2\files-2.1\org.apache.maven\maven-artifact\3.5.3\7dc72b6d6d8a6dced3d294ed54c2cc3515ade9f4\maven-artifact-3.5.3.jar
[18:48:45] [main/ERROR] [FML]: Trimmed: c:/users/planetteamspeak/.gradle/caches/modules-2/files-2.1/org.apache.maven/maven-artifact/3.5.3/
[18:48:45] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[18:48:45] [main/INFO] [FML]: Detected deobfuscated environment, loading log configs for colored console logs.
2019-05-07 18:48:46,139 main WARN Disabling terminal, you're running in an unsupported environment.
[18:48:46] [main/INFO] [FML]: Ignoring missing certificate for coremod FMLCorePlugin (net.minecraftforge.fml.relauncher.FMLCorePlugin), we are in deobf and it's a forge core plugin
[18:48:46] [main/INFO] [FML]: Ignoring missing certificate for coremod FMLForgePlugin (net.minecraftforge.classloading.FMLForgePlugin), we are in deobf and it's a forge core plugin
[18:48:46] [main/INFO] [FML]: Searching M:\EclipseWorkspace\MoreCommands 1.12\run\.\mods for mods
[18:48:46] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.CoremodTweaker
[18:48:46] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.fml.relauncher.FMLCorePlugin
[18:48:46] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.classloading.FMLForgePlugin
[18:48:46] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:48:46] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[18:48:46] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[18:48:46] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:48:46] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[18:48:46] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[18:48:47] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing
[18:48:47] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[18:48:47] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[18:48:48] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[18:48:48] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[18:48:48] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[18:48:48] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[18:48:48] [main/INFO] [minecraft/Minecraft]: Setting user: Player112

I am really stuck on this, I have no idea what could be the problem all of a sudden.

EDIT: it builds just fine and the built jar works fine on normal Forge as well.

Edited May 7, 20196 yr by PlanetTeamSpeak

Alright it seems to have been caused by the fact that I used a Gradle nature, I am not sure, but if this is the case I believe it to be a bug.

Alright, I found the problem. You should not run setupDecompWorkspace once it has been ran once. It will ruin everything. Although I do not know any other way to update your mappings.