我有问题，项目跑不起来。 #50

892694331@qq.com Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:support-v4:19.+.
ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:support-v4:19.+.
ERROR: Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:support-v4:19.+.
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Affected Modules: app