Using backupLink for mcjsons/versions/1.10.2/1.10.2.json
 Setting up native libraries for FTB Presents Skyfactory 3 v Recommended Version MC 1.10.2
 Loading jars…
 Added URL to classpath: file:/D:/FTBLauncher/FTBPresentsSkyfactory3/instMods/MinecraftForge.zip
 Added URL to classpath: file:/D:/FTBLauncher/FTBPresentsSkyfactory3/minecraft/bin/minecraft.jar
 Loading natives…
 Natives loaded…
 Loading minecraft class
 янв 23, 2018 4:45:45 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)
 Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0
 didn't get a 200 response code!
 Log upload failed. Use "Copy to clipboard" button and 
 manually paste log into paste.feed-the-beast.com
 didn't get a 200 response code!
 Log upload failed. Use "Copy to clipboard" button and 
 manually paste log into paste.feed-the-beast.com
Похожая проблема была, решил её переустановкой игры.
 Скачивал отсюда: mconly.ru
 Неплохой сайт, до сих пор играю без проблем.