Minecraft Feed the Beast Unleashed not Launching

When I try to launch feed the beast unleashed this comes up in the console

Logging in...
Beginning authlib authentication attempt
successfully created YggdrasilAuthenticationService
Login complete.
Unexpected end of ZLIB input stream: java.io.EOFException: Unexpected end of ZLIB input stream
Syncing Assets:
C:\\Unleashed\minecraft\bin\minecraft.jar
Java Path: C:\Program Files\Java\jdk1.7.0_13\bin\javaw.exe
Pack: FTB Unleashed 1.5.2
Setting MinMemory to 256
Setting MaxMemory to 4095
Defaulting PermSize to 256m
Adding Optimization Arguments
Loading jars...
Added URL to classpath: file:/C:/Unleashed/instMods/MinecraftForge.zip
Added URL to classpath: file:/C:/Unleashed/minecraft/bin/minecraft.jar
Loading natives...
Natives loaded...
Loading minecraft class
May 24, 2014 1:50:10 PM net.ftb.legacylaunch.Launch main
SEVERE: Unhandled error launching minecraft
java.lang.NoClassDefFoundError: mc
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at net.ftb.legacylaunch.Launch.main(Launch.java:85)
Caused by: java.lang.ClassNotFoundException: mc
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 12 more

But stops after that and nothing happens

Please Help!!

system specs:
Windows 7 Ultimate x64
AMD Bulldozer FX-6100 6 core CPU
8gb Corsair Vengeance ddr3 RAM
Asus Radeon R9 280X Matrix Platinum 3gb
Corsair RM850
Asus M5A97 LE R2.0 Motherboard
Aerocool Strike-X GT Toolless Mid Tower Gaming Case