Keeps on crashing

[Suited Gaming]

Title:

Keeps on crashing​

Launcher Version:

1.6.61​

Modpack:

unstable​

Modpack Version:

​

Log Link:

​

Details of the issue:

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0
[23:12:27] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[23:12:27] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_91]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_91]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[?:1.8.0_91]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_91]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_91]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_91]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_91]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_91]
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:?]

this error is displayed can anyone help​

 

[jikuja]

If this is from Curse open a new bug report by using their software.

If FTB Launcher check your antivirus settings and then On the launcher go to options then click the force update button, then launch the modpack.