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Problem when I start forge


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[07:12:36] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[07:12:36] [main/ERROR]: Unable to launch

java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker

at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[?:1.7.0_111]

at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_111]

at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_111]

at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_111]

at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_111]

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[?:1.7.0_111]

at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_111]

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]

at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_111]

at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_111]

at java.lang.Class.forName0(Native Method) ~[?:1.7.0_111]

at java.lang.Class.forName(Class.java:278) ~[?:1.7.0_111]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]


I using java 8 (I had tried it with java 7 same) dist: Debian/GNU 8 Jessie with KDE adn the newest forge version


LG SG.Kongel

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Post the full FML log (logs/fml-client-latest.log) using Gist.


It looks like you may be trying to load a 1.7.10 version of Forge as a mod in a newer version of Forge, which won't work (and doesn't make any sense).

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

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1.7.10 is no longer supported by Forge.

Don't PM me with questions. They will be ignored! Make a thread on the appropriate board for support.


1.12 -> 1.13 primer by williewillus.


1.7.10 and older versions of Minecraft are no longer supported due to it's age! Update to the latest version for support.



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