Firebase Error: "Previous value was empty"

[Rogerio_Rios (Professional Support)]

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the author wrote :
Its time to solve the Append Error, just set the Blocks as given below"

Firebase Database | A Guide for Beginners

Hi, Koders! I observed that there were many queries on Firebase Database even me ! but eventually after trials and errors, I solved the problem I had posted a solution to a Koder who had the same issue but I thought to make a more comprehensive guide on Firebase for begginers. So lets get started! Lets understand the blocks The below warning is because there is no blocks associated with it. [Firebase Database Data Changed] This is an event triggered when the data changes in firebase, for ex…