[Solved] How do I solve this issue? I get this error while building an android project with gradle

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To fix this error, you need to add a value for UniqueFirebaseUrl in your gradle.properties file. You should create a file and add a line that looks like this: UniqueFirebaseRootUrl = “https://shoppinglistplspls.firebaseio.com/“

source: https://github.com/udacity/ShoppingListPlusPlus/issues/8

solved How do I solve this issue? I get this error while building an android project with gradle