Studio导包时报Unable to resolve dependency for ':app@debug/compileClasspath'

buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        beta {

            //关键代码，release， debug为library中已有buildType
            matchingFallbacks = ['release', 'debug']
        }

    }



}