[android studio] Could not resolve all dependencies for configuration 에러 발생 시...

Android studio를 처음 빌드할 때, 아래와 같은 에러가 발생할 수 있음.

* What went wrong:

A problem occurred configuring project ':app'.

> Could not resolve all dependencies for configuration ':app:_debugCompile'.

   > Could not find any version that matches com.android.support:appcompat-v7:+.

     Required by:

         OpenSpritz-Android:app:unspecified

   > Could not find any version that matches com.android.support:support-v4:+.

     Required by:

         OpenSpritz-Android:app:unspecified

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

해결방법은 Android SDK Manager를 열어서, Extras - Android Support Repository를 install 하면 됨.