如题，我的FTB启动器就算下载好了整合包，也会发生错误
Logging in...
Beginning authlib authentication attempt
successfully created YggdrasilAuthenticationService
Login complete.
Checking local assets file, for MC version1.7.10 Please wait!
library JSON download failed: java.net.ConnectException: Connection timed out: connect
Setting up native libraries for Blast Off! v Recommended Version MC 1.7.10
Syncing Assets:
Java Path: C:\Program Files\Java\jre7\bin\javaw.exe
Pack: Blast Off! 1.7.10
Setting MinMemory to 256
Setting MaxMemory to 2816
Defaulting PermSize to 256m
Additional java parameters: -XX:MaxPermSize=1024m
[16:04:03] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[16:04:04] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[16:04:04] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/collect/Lists
at cpw.mods.fml.common.launcher.FMLTweaker.acceptOptions(FMLTweaker.java:50)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Lists
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 3 more