Duel Personality is a 1966 Tom and Jerry cartoon produced and directed by Chuck Jones. It is the first Tom and Jerry cartoon released in 1966, and the first Tom & Jerry cartoon (both regarding Tom and Jerry produced by Chuck Jones, and Tom and Jerry cartoons produced altogether) with Dean Elliott as the music composer.
Chuck Jones was the sole producer of Duel Personality
The statement doesn't indicate that Chuck Jones was the sole producer, only that he was a producer.  The system must have thought he was the sole producer.
( z1 produce :ARG0 ( z2 person :name ( z3 name :op "Chuck" :op "Jones" ) :mod ( z4 sole ) ) :ARG1 ( z5 broadcast-program :name ( z6 name :op "Duel" :op "Personality" ) ) )