I have recently began modding with forge again, after some experience with modding with Risugami's Modloader. I knew how to set up directory, etc-but looked up a lot of videos just in case- I'm a little rusty.

I set up the source code for forge, then used the INSTALLER-- 'install.bat', if I remember correctly, to set up MCP. It looked good until it got to the bottom. Then, it said--

================ Forge ModLoader Setup Start ===================

Checking MCP zip (may take time to download)

Extracting MCP to 'C:\Users\Monkers\Desktop\forgeMod\forge\mcp'

Setting up MCP

Patching commands.py

patching file commands.py

    Commands patch applied successfully

Copying FML conf

Creating Repackaged data

    Creating re-packaged srg

    Creating re-packaged exc

    Creating re-packaged MCP patches

Fixing MCP Workspace

Downloading 42 libraries

    launchwrapper-1.8.jar Done

    asm-debug-all-4.1.jar Done

    asm-debug-all-4.1-sources.jar Done

    scala-library-2.10.2.jar Done

    scala-library-2.10.2-sources.jar Done

    scala-compiler-2.10.2.jar Done

    scala-compiler-2.10.2-sources.jar Done

    jopt-simple-4.5.jar Done

    jopt-simple-4.5-sources.jar Done

    lzma-0.0.1.jar Done

    codecjorbis-20101023.jar Done

    codecwav-20101023.jar Done

    libraryjavasound-20101123.jar Done

    librarylwjglopenal-20100824.jar Done

    soundsystem-20120107.jar Done

    lwjgl-2.9.0.jar Done

    lwjgl-2.9.0-sources.jar Done

    lwjgl_util-2.9.0.jar Done

    lwjgl_util-2.9.0-sources.jar Done

    argo-2.25_fixed.jar Done

    argo-2.25.jar Done

    argo-2.25-sources.jar Done

    bcprov-jdk15on-1.47.jar Done

    bcprov-jdk15on-1.47-sources.jar Done

    guava-14.0.jar Done

    guava-14.0-sources.jar Done

    commons-lang3-3.1.jar Done

    commons-lang3-3.1-sources.jar Done

    commons-io-2.4.jar Done

    commons-io-2.4-sources.jar Done

    jinput-2.0.5.jar Done

    jinput-2.0.5-sources.jar Done

    jutils-1.0.0.jar Done

    jutils-1.0.0-sources.jar Done

    gson-2.2.2.jar Done

    gson-2.2.2-sources.jar Done

    lwjgl-platform-2.9.0-natives-windows.jar Done

        Extracting OpenAL32.dll

        Extracting OpenAL64.dll

        Extracting lwjgl.dll

        Extracting lwjgl64.dll

    lwjgl-platform-2.9.0-natives-osx.jar Done

        Extracting liblwjgl.jnilib

        Extracting openal.dylib

    lwjgl-platform-2.9.0-natives-linux.jar Done

        Extracting liblwjgl.so

        Extracting liblwjgl64.so

        Extracting libopenal.so

        Extracting libopenal64.so

    jinput-platform-2.0.5-natives-windows.jar Done

        Extracting jinput-dx8.dll

        Extracting jinput-dx8_64.dll

        Extracting jinput-raw.dll

        Extracting jinput-raw_64.dll

        Extracting jinput-wintab.dll

    jinput-platform-2.0.5-natives-osx.jar Done

        Extracting libjinput-osx.jnilib

    jinput-platform-2.0.5-natives-linux.jar Done

        Extracting libjinput-linux.so

        Extracting libjinput-linux64.so

Backing up client

Downloaded 1.6.4.jar

Backing up server

Download of minecraft_server.1.6.4.jar failed hash check, deleting abcf286a14f7a

ee82e8bf89270433509 ba3145656b1480122bd8759cecd7b7a1

Something failed verifying minecraft files, see log for details.

Decompile Exception: 1

Press any key to continue . . .

 

 

I thought, oh well it probably does this all the time, so I redownloaded it after deleting MCP from it. I tried again, and the same thing happened. 5 times. I tried decompiling first, but no luck. I started up Eclipse Luna but, even though the directory was correct it always said 'Build path specifies execution environment JavaSE-1.6. There are no JREs installed in the workspace that are strictly compatible with this environment. Minecraft Build path JRE System Library Problem' I guess I've been as clear as I can, and I hope you can help me. -Monkermon

 

The installer for 1.6.4 does not work anymore, you need to either switch to gradle or create a patch for the installer.