[15:09:31] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[15:09:31] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_92]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_92]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
That's the entire log. It doesn't matter what mods are in the mods folder, it still doesn't launch. We've tried changing Java versions as well, no luck. I recreated his setup in the curse launcher with the same Java and mods and I successfully launch.
Fixed. For those who end up in the same boat as my friend in the future, this occurs when forge-1.9.4-12.17.0.19.0.1987.jar (or whatever forge version you are using) is either not fully downloaded or corrupt. The fix is to delete the file and let the launcher download it again.
[15:09:31] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[15:09:31] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_92]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_92]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_92]
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:?]
That's the entire log. It doesn't matter what mods are in the mods folder, it still doesn't launch. We've tried changing Java versions as well, no luck. I recreated his setup in the curse launcher with the same Java and mods and I successfully launch.Fixed. For those who end up in the same boat as my friend in the future, this occurs when forge-1.9.4-12.17.0.19.0.1987.jar (or whatever forge version you are using) is either not fully downloaded or corrupt. The fix is to delete the file and let the launcher download it again.