About the 11. Databases and the Room Library category

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The code that came with the book for chapter 11 is not working. Room.databaseBuilder always sets the database field to null. The criminalIntent application is always empty.
I had uploaded the databases folder as mentioned in the book. I debug the application and found database variable is always set to null. The room library is not able to access the crime-database.
Can anyone help me with this. Why am I not seeing the data pulled from the database.