As recognized by the state it was error for the court to allow the prosecuting attorney to examine defendant as to whether he had previously entered and withdrawn a guilty plea in this case (Code Ann. 27-1404), but we are unable to agree with the state that it is "highly probable that the error did not contribute to the judgment." Johnson v. State, 238 Ga. 59
, 61 (230 SE2d 869
Larry Joe Mathis, pro se.