skyfactory 3 ftb cant load up

[rjthelegend13]

when I try to open skyfactory 3 it comes up with the code below I have installed it and is up to date. don't know what I should do. can u help plz??

 

Logging in...
Beginning authlib authentication attempt
successfully created YggdrasilAuthenticationService
Login complete.
Checking local assets file, for MC version1.10.2 Please wait!
Using backupLink for mcjsons/versions/1.10.2/1.10.2.json
GET request for mcjsons/versions/1.10.2/1.10.2.json failed. Please Send log to launcher team and provide your public IP address if possible.
Setting up native libraries for FTB Presents Skyfactory 3 v Recommended Version MC 1.10.2
Syncing Assets:
Not loading any FML libs, as the directory does not exist.
Java Path: C:\Program Files (x86)\Java\jre1.8.0_121\bin\javaw.exe
Pack: FTB Presents Skyfactory 3 1.10.2
Setting MinMemory to 256
Setting MaxMemory to 1024
Loading jars...
Added URL to classpath: file:/c:/ftb/FTBPresentsSkyfactory3/instMods/MinecraftForge.zip
Added URL to classpath: file:/c:/ftb/FTBPresentsSkyfactory3/minecraft/bin/minecraft.jar
Loading natives...
Natives loaded...
Loading minecraft class
Feb 06, 2017 9:49:37 PM net.ftb.legacylaunch.Launch main
SEVERE: Unhandled error launching minecraft
java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
 at java.net.URLClassLoader.findClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at net.ftb.legacylaunch.Launch.main(Launch.java:85)

[larsgerrits]

I don't know what's up with your crash, but I can tell you one thing:

1 hour ago, rjthelegend13 said:

Setting MaxMemory to 1024

 

1GB of RAM is for sure not enough of RAM for Sky Factory 3. You need at least 3 to 4 GB assigned to Minecraft.

[LexManos]

Use Mojang's launcher