最新Android Studio解决＞ No cached version of org.javailable for offline mode.

 问题

A problem occurred configuring root project 'kaikeba'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20.
     Required by:
         project :
      > No cached version of org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20 available for offline mode.
      > No cached version of org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20 available for offline mode.
      > No cached version of org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20 available for offline mode.
      > No cached version of org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20 available for offline mode.
      > No cached version of org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20 available for offline mode.
> A problem occurred configuring project ':flutter'.
   > A problem occurred evaluating project ':flutter'.
      > Plugin with id 'com.android.library' not found.

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