在上找不到属性"UniqueFirebaseRootUrl"com.android.build.gradle.AppExtension_Decorated@3910186.
若要修复此错误，您需要在gradle.properties文件中添加UniqueFirebaseUrl的值。您应该创建一个文件并添加一行，如下所示：UniqueFirebaseRootUrl="https://shoppinglistplspls.firebaseio.com/">
来源：https://github.com/udacity/ShoppingListPlusPlus/issues/8
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