<Unable to insert data to Room database> I am tryi...

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Unable to insert data to Room database
I am trying to insert values to room database but it's not working, I checked the database, and the tables were not created. I have created the database, DAO and Repository in java and calling the insert dao inside a coroutine in MainActivity Kotlin class.
DAO
@Insert
public void addExpense(List exp);

Repository
public class Repository {
private ExpensesDao expensesDao;
private SubscriptionsDao subscriptionsDao;
private static AppDatabase db;

public Repository(Context...