Crash report

Logging in...
Beginning authlib authentication attempt
successfully created YggdrasilAuthenticationService
Login complete.
Checking local assets file, for MC version1.7.10 Please wait!
Setting up native libraries for Banished v Recommended Version MC 1.7.10
Syncing Assets:
Java Path: C:\Program Files\Java\jre7\bin\javaw.exe
Pack: Banished 1.7.10
Setting MinMemory to 256
Setting MaxMemory to 5120
Defaulting PermSize to 256m
[19:18:15] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:18:15] [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_71]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_71]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_71]
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_71]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.11.jar:?]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
	at java.lang.Class.forName0(Native Method) ~[?:1.7.0_71]
	at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_71]
	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:?]