Unique constraint failed room database android

Question

I\'m facing a problem with Room database, when trying to use insert method that I declared in Dao Class to write a data into database this error shows up:

Answer 1

I figure it out, that error because there is no unique value in data (in primaryKey) so I make it auto generated,

Model Class

@Entity
public class Task {
    @PrimaryKey(autoGenerate = true)
    private int uid;
    ...
}