Cannot create an instance of class ViewModel kotlin

Question

Here is my code

class BookmarkViewModel(app: Application) : AndroidViewModel(app) {

    private val dao = BookmarkDb.get(app).bookmarkDao()

    companion o         


        

Answer 1

In my case, I had forgotten to annotate my DatabaseClass class with

@Database(entities = [Book::class], version = 1)
abstract class BookRoomDatabase: RoomDatabase()