Sky Factory 3 crashes when loading

[morematthew]

Title Sky Factory 3 crashes when loading

Launcher Type Twitch Desktop App

Modpack Sky factory 3

Modpack version 1.10.2

Have you modified the pack? No

Link to log file
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0
[18:33:27] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[18:33:27] [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_141]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_141]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) ~[?:1.8.0_141]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_141]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_141]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_141]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_141]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_141]
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:?]


Details of the issue It works on my bad Pc but when i try to play on the mac, it crashes and does not load

 

[morematthew]

plz help

 

[mc.crab]

In Twitch app click the pack and then click on the three dots on top right corner and select repair Minecraft.