Open 1.7.0: Infinity Evolved refuses to start

[D3V1L77]

Version:
2.4.2 [2.5.0]

What is the bug:
when i try to start up infinity evolve through the curse launcher this message appears in the minecraft loading screen.

[19:17:26] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:17:26] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader$1.run(URLClassLoader.java:372) ~[?:1.8.0_25]
at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
at java.net.URLClassLoader.findClass(URLClassLoader.java:360) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]
at java.lang.Class.forName(Class.java:344) ~[?:1.8.0_25]
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:?]
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0



i have no idea what to do and have looked all over the forums for a fix and cannot seem to find one... pls help.

Mod & Version:
infinity evolved version 2.5.0

Paste.feed-the-beast.com log:


Can it be repeated:


Known Fix:

 

[Booker The Geek]

Force update the pack, try again. If you still get this then upload a crash report or console log to pastebin and link here

 

[mc.crab]

Curse launcher doesn't have force update, take a look at this. https://gist.github.com/jikuja/7e0828dca7d264e850be306b58893127

 

[Booker The Geek]

Force update = delete pack, then reinstall

Also, java is outdated.