android studio error 'unable to merge dex'

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android studio error 'unable to merge dex'

1. clean project -> rebuild

2. 添加  'multiDexEnabled true' 在 (app级别)build.gradle:

{
defaultConfig 
{   multiDexEnabled true}
}

3. 删除 :

//implementation fileTree(dir: 'libs', include: ['*.jar'])

 compile ('com.google.android.gms:play-services-vision:9.4.0+'){
        exclude module: 'support-v4'
    }