[Solved] Android Room: Database Common Error ‘missing database’

Common error 1:

D:\AndroidProjectsDemo\JetpeckTest\app\build\tmp\kapt3\stubs\debug\com\example\jetpecktest\room\BookDao.
java:15: error: There is a problem with the query: [SQLITE_ERROR] 
SQL error or missing database (no such table: BookEntity)
public abstract java.util.List<com.example.jetpecktest.room.BookEntity> loadAllBooks();

**Solution: * * the error report mentions no such table: bookentity , so first check whether your class is added to the database, that is, check the entities =?In the
annotation in your database class did you add your entity class.

@Database(version = 2, entities = [BookEntity::class])
abstract class DataBase:RoomDatabase() {

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