Answers for "cannot insert duplicate key in object the duplicate key value is (1)"

Cannot insert duplicate key in object 'dbo.Instructor'. The duplicate key value is (2).

DBCC CHECKIDENT ('TABLE_NAME_GOES_HERE', RESEED, ZZZZZ);

Cannot insert duplicate key in object 'dbo.Instructor'. The duplicate key value is (2).

DBCC CHECKIDENT ('TABLE_NAME_GOES_HERE', NORESEED);