Minecraft Forums

A friend of mine made a mod pack For 1.7.10 and put it on the curse launcher. When i downloaded it and launched the pack it gives me this error.

[10:52:56] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[10:52:56] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_101]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_101]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_101]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_101]
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 have uninstalled and reinstalled java, the pack, and curse all together. As well as copying the pack to a separate location and trying to run it there.

any advice would be appreciated.

Provide the full crash report. Also, could your friend boot up the modpack?

Anon im not sure were to get the full crash report and yes they were able to boot the pack. if u would give me some clarification on where to get the crash report i would be happy to post it.

In addition to the "latest.log" there's also "fml-client-latest.log" Did you friend upload the modpack to Curse correctly? It sounds kinda like either missing Forge (not sure how that's possible) or corrupted download of Forge.