[Problema] crash modpack "all the mods" di curse

Ho appena scaricato il client di CURSE e ho scaricato il pack "all the mods", quando avvio si apre la pagina del launcher di minecraft ma quando apro il gioco mi esce un schermata game output con scritto:

2016-09-20 14:56:32,079 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[14:56:32] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[14:56:32] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_80]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_80]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_80]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_80]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_80]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.7.0_80]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_80]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_80]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_80]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_80]
at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_80]
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:?]

Sapreste dirmi qual è il problema e come risolverlo? Grazie in anticipo!!!
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