当我们添加某些依赖库（Okhttp、Retrofit）时， Android studio 会报如下错误：

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.

需要注意的在最后一行，  > No cached version of com.facebook.network.connectionclass:connectionclass:1.0.1 available for offline mode.

我们需要做的是，取消红色边框标记的选项，然后 build Gradle 。

踩坑实录 Android studio中关于 No cached version of **** available for of处理办法