So I just downloaded the pack but when I launch it I get this error in the console... any help? (sorry if its irrelevant to the pack, i'm new to this)
[main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_21]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_21]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_21]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.11.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_21]
at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_21]
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:?]
[main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_21]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_21]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_21]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.11.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_21]
at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_21]
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:?]