android studio 3.6 No cached version of***available for offline mode

Android studio 更新到3.6版本后，打开项目，发现会报错，报的还是Gradle 模式的错误

错误：
Error:A problem occurred configuring project ':app'.

Could not resolve all dependencies for configuration ':app:_iranDebugCompile'.
Could not resolve com.facebook.network.connectionclass:connectionclass:1.0.1.
Required by:
doctor:app:unspecified
No cached version of com.facebook.network.connectionclass:connectionclass:1.0.1 available for offline mode.

在编辑器右边侧边了，有gradle选项，点击后，可以看到这个选项，切换模式就可以解决这个问题了。