FTB Infinity not launching

[Wanderingcleric]

Title:

FTB Infinity not launching​

Launcher Version:

1.4.11​

Modpack:

Infinity​

Modpack Version:

2.2.2​

Log Link:

​

Details of the issue:

Infinity won't load. It goes through the loading screen but when it finishes it goes straight back to the launcher.​

 

[jikuja]

Do you want us to guess or is it possbile to get all information asked in the the template? (troubleshooting is really hard without logs)

 

[ShadowFiji]

I had the same issue.
I got this:

[21:17:00] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[21:17:00] [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

 

[jikuja]

I had the same issue.
I got this:
...

How do you know you have same issue? Symptoms are same but cause probably is not...