AndroidStudio

Android Studio 2.2.3 でHallo wold でいきなりError:(23, 17) Failed to resolve: junit:junit:4.12 (死)

Hallo wold でいきなり(死) 表題のError:(23, 17) Failed to resolve: junit:junit:4.12 Error:A problem occurred configuring project ':app'.> Could not resolve all dependencies for configuration ':app:_debugUnitTestApkCopy'. > Could not resol…