ERROR: Could not determine java version from 'JavaVersion.VERSION_1_8'.

写法原为：

  compileOptions {
        sourceCompatibility 'JavaVersion.VERSION_1_8'
        targetCompatibility 'JavaVersion.VERSION_1_8'
    }

　　修改为：

  compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }