Problem with FTB INfinity starting

[Shadow17]

Title:

Problem with FTB INfinity starting​

Launcher Version:

1.7.0​

Modpack:

FTB Infinity​

Modpack Version:

1.7.0​

Log Link:

​

Details of the issue:

[13:20:52] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[13:20:52] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_45]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_45]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_45]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_45]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.11.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_45]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_45]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_45]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_45]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.11.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]



what does this means and how can i fix the problem.​

 

[UniZero]

Post the complete log and use pastebin. Try a force update of the pack.

 

[OreCruncher]

Have you tried reinstalling?