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[p]Update: I'm happy to say that I'm able to play moded minecraft again. Thanks to all the folks on minecraft forums who helped me. Case Closed.[/p]
[p]No Mods were Installed while reproducing this crash.[/p]
[p]Fouge used to run on my pc but after I installed Mcreator, things started to go downhill:[/p] [p]I installed Mcreator from (mcreator.pylo.co)[/p]
[p](see Attachment below.)[/p]
[p]I first install the portable (zip) version of the software, then I abort the portable installation halfway through the installation, then I downloaded the main setup(installer) which went through the complete setup. Then, after using the program for some time, I discovered that minecraft is unable to run forge, and quickly uninstall Mcreator.[/p]
[p]This is the crash report for Forge 1.12.2 - 14.23.0.2491(Stable) below:[/p]
[spoiler]

> [23:11:48] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:func_179870_a:553]: ---- Minecraft Crash Report ---- > // This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~] > > Time: 10/17/17 11:11 PM > Description: Initializing game > > java.lang.IllegalArgumentException: Multiple entries with same key: ism=FMLMod:ism{1.5.13 MC-1.1.11.2} and ism=FMLMod:ism{1.5.9 MC-1.8}. To index multiple values under a key, use Multimaps.index. > at com.google.common.collect.Maps.uniqueIndex(Maps.java:1385) > at com.google.common.collect.Maps.uniqueIndex(Maps.java:1341) > at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:405) > at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:543) > at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:227) > at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:466) > at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377) > at net.minecraft.client.main.Main.main(SourceFile:123) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) > at java.lang.reflect.Method.invoke(Unknown Source) > at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) > at net.minecraft.launchwrapper.Launch.main(Launch.java:28) > > > A detailed walkthrough of the error, its code path and all known details is as follows: > --------------------------------------------------------------------------------------- > > -- Head -- > Thread: Client thread > Stacktrace: > at com.google.common.collect.Maps.uniqueIndex(Maps.java:1385) > at com.google.common.collect.Maps.uniqueIndex(Maps.java:1341) > at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:405) > at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:543) > at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:227) > at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:466) > > -- Initialization -- > Details: > Stacktrace: > at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377) > at net.minecraft.client.main.Main.main(SourceFile:123) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) > at java.lang.reflect.Method.invoke(Unknown Source) > at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) > at net.minecraft.launchwrapper.Launch.main(Launch.java:28) > > -- System Details -- > Details: > Minecraft Version: 1.12.2 > Operating System: Windows 10 (amd64) version 10.0 > Java Version: 1.8.0_144, Oracle Corporation > Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation > Memory: 93111888 bytes (88 MB) / 296202240 bytes (282 MB) up to 3207856128 bytes (3059 MB) > JVM Flags: 5 total; -Xmx3072M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M > IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 > FML: MCP 9.42 Powered by Forge 14.23.0.2491 6 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 > > | State | ID | Version | Source | Signature | > |:----- |:--------- |:------------------ |:----------------------------- |:---------------------------------------- | > | | minecraft | 1.12.2 | minecraft.jar | None | > | | mcp | 9.42 | minecraft.jar | None | > | | FML | 8.0.99.99 | forge-1.12.2-14.23.0.2491.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | > | | forge | 14.23.0.2491 | forge-1.12.2-14.23.0.2491.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | > | | ism | 1.5.9 MC-1.8 | Closed mods | None | > | | ism | 1.5.13 MC-1.1.11.2 | Closed mods | None | > > Loaded coremods (and transformers): > GL info: ' Vendor: 'Intel' Version: '4.4.0 - Build 21.20.16.4534' Renderer: 'Intel(R) HD Graphics 620' > Launched Version: Forge 1.12.2 > LWJGL: 2.9.4 > OpenGL: Intel(R) HD Graphics 620 GL version 4.4.0 - Build 21.20.16.4534, Intel > 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 (United Kingdom) > Profiler Position: N/A (disabled) > CPU: 4x Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz > [23:11:48] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:func_179870_a:553]: #@[email protected]# Game crashed! Crash report saved to: #@[email protected]# C:\Users\Tan Yong Sing\AppData\Roaming\.minecraft\crash-reports\crash-2017-10-17_23.11.48-client.txt > Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release Here I am!

[/spoiler]
[p]
[/p] [p]And this is the crash report for the forge version I want to run (1.10.2-forge1.10.2-12.18.3.2185):[/p] [p]

Time: 18/10/17 9:32 AM[/p]

[spoiler]> Description: Initializing game
> 
> java.lang.IllegalArgumentException: Multiple entries with same key: ism=FMLMod:ism{1.5.13 MC-1.1.11.2} and ism=FMLMod:ism{1.5.9 MC-1.8}
> at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150)
> at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104)
> at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70)
> at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254)
> at com.google.common.collect.Maps.uniqueIndex(Maps.java:1166)
> at com.google.common.collect.Maps.uniqueIndex(Maps.java:1140)
> at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:384)
> at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:521)
> at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:218)
> at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:439)
> at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:351)
> at net.minecraft.client.main.Main.main(SourceFile:124)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
> at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
> 
> 
> A detailed walkthrough of the error, its code path and all known details is as follows:
> ---------------------------------------------------------------------------------------
> 
> -- Head --
> Thread: Client thread
> Stacktrace:
> at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150)
> at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104)
> at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70)
> at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254)
> at com.google.common.collect.Maps.uniqueIndex(Maps.java:1166)
> at com.google.common.collect.Maps.uniqueIndex(Maps.java:1140)
> at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:384)
> at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:521)
> at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:218)
> at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:439)
> 
> -- Initialization --
> Details:
> Stacktrace:
> at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:351)
> at net.minecraft.client.main.Main.main(SourceFile:124)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
> at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
> 
> -- System Details --
> Details:
> Minecraft Version: 1.10.2
> Operating System: Windows 10 (amd64) version 10.0
> Java Version: 1.8.0_144, Oracle Corporation
> Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
> Memory: 123715288 bytes (117 MB) / 334688256 bytes (319 MB) up to 3207856128 bytes (3059 MB)
> JVM Flags: 5 total; -Xmx3072M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
> IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
> FML: MCP 9.32 Powered by Forge 12.18.3.2185 6 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
> mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
> FML{8.0.99.99} [Forge Mod Loader] (forge-1.10.2-12.18.3.2185.jar) 
> Forge{12.18.3.2185} [Minecraft Forge] (forge-1.10.2-12.18.3.2185.jar) 
> mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.10.2.jar) 
> ism{1.5.9 MC-1.8} [Instant Structures Mod (ISM)] (Closed mods) 
> ism{1.5.13 MC-1.1.11.2} [Instant Structures Mod (ISM)] (Closed mods) 
> Loaded coremods (and transformers): 
> GL info: ' Vendor: 'Intel' Version: '4.4.0 - Build 21.20.16.4534' Renderer: 'Intel(R) HD Graphics 620'
> Launched Version: 1.10.2-forge1.10.2-12.18.3.2185
> LWJGL: 2.9.4
> OpenGL: Intel(R) HD Graphics 620 GL version 4.4.0 - Build 21.20.16.4534, Intel
> 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: 4x Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
> [09:32:44] [Client thread/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:func_179870_a:560]: #@[email protected]# Game crashed! Crash report saved to: #@[email protected]# C:\Users\Tan Yong Sing\AppData\Roaming\.minecraft\crash-reports\crash-2017-10-18_09.32.44-client.txt
Here I am!

[/spoiler]

[p]I'm using Tlauncher as my minecraft launcher.[/p]

I was thinking about using spoilers too.

The "closed mods" folder is there to store mods that I don't want forge to run

but how do I make forge not run mods that I don't want, such as incompatibility?

sent from my iPhone, I will check my affected PC asap.

In my ~.minecraft/mods I added a folder for each version (just like the /versions folder)... solved that problem.

I also added a /TempStorage folder (Forge doesn't go there). Primarily for a backup of my current world but I have on occation temporarily moved a Mod or two in there.

Yeah, but then say, I wanted worldedit 1.10 to run instead of pixalmon 1.10, should I put pixalmon~.jar into .minecraft or in .minecraft/mods/1.10/mods jars or

.minecraft/mods/1.10/temp

simply some thing that forge would ignore. But what folders does forge ignore?

If a PC... (I have no idea what a Mac or Linux looks like)

C:\Users\nevernind\AppData\Roaming\.minecraft\mods\1.10 - all 1.10 mods you want to run .jar, .exe, .litemod, whatever.

I also have a C:\Users\nevernind\AppData\Roaming\.minecraft\mods\1.12.2. I can run MC version 1.12.2 or 1.10. with the correct mods by simply selecting the correct version in the launcher.

I added: C:\Users\nevernind\AppData\Roaming\.minecraft\TempStorage - Forge ignores it. You can place any mod of any version here and it will not run. I use a simple method to name my worlds Year/month/day(created) Version ie 2017Sep19 1.12.2. I keep a copy of my world here just in case something catastrophic happens. I only lose the last time I played.

Forge ignores all folders that the launcher didn't create.

yeah, because "tempstorage" is outside of the "mods" folder, I wonder how deep your mod could go in the "mods" folder untill forge could not detect it?

Quote from yuliangthebuizel»

yeah, because "tempstorage" is outside of the "mods" folder, I wonder how deep your mod could go in the "mods" folder untill forge could not detect it?

I'm not certain you are picking up what I'm putting down...
I have one C:\Users\nunyaBusiness\AppData\Roaming\.minecraft\mods\ folder.
In there I can have hundreds of additional folders, one for each different version (1.10, 1.11, 1.12, 1.12.1, 1.12.2, etc). Each folder contains the mods I want to run with that MC version... it isn't complicated.

Look at your C:\Users\YourName\AppData\Roaming\.minecraft\versions\ folder. It is exactly the same if you run multiple versions...

In your C:\Users\YourName\AppData\Roaming\.minecraft\ folder you can create any new folder and call it anything as long you don't use a name created by the launcher... Forge will not run anything in a folder you created with the possible exception of one containing a version number... But I honestly doubt Forge will recognize a version number in any folder you created!!!

In the past, I used 2 different launchers. One by sk89q and also MagicLauncher. With the latest MC launcher I see no reason to do that any longer.
I let the Vanilla name alone (i.e. 1.12.2). I rename the Forge version i.e. 1.12.2F(for Forge)-(Forge version)2386. I extend the Forge version with LiteLoader and rename that 1.12.2FL-2386.
I can launch vanilla (1.12.2 - no mods), Forge (1.12.2F-2386 - Forge mods), or Forge and LiteLoader (1.12.2FL-2386 - both Forge and LiteLoader mods).