버전 충돌을 해결할 수 없습니다.

Question

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    compile 'com.android.support:appcompat-v7:21.0.2' 
    compile 'com.google.android.gms:play-services:6.1.71' 
    compile 'com.google.firebase:firebase-database:10.0.1' 
} 

오류 : (30, 0) 버전 : 6.1.71이 (가) Google 서비스 플러그인에 필요한 최소 버전 (9.0.0)보다 낮습니다.

Answer 1

just bump the version of play services to 10.0.1 

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    compile 'com.android.support:appcompat-v7:21.0.2' 
    compile 'com.google.android.gms:play-services:10.0.1'<---- change 
    compile 'com.google.firebase:firebase-database:10.0.1' 
}