How do Christians of the church of Jesus of latter day saints reconcile the teaching that no man has ever seen or can see God?

I was approached yesterday by a lady with a very beautiful western accent who gave me a booklet about the church of Jesus Christ of latter day saints. In the booklet I was introduced to a prophet named Joseph Smith who claims that he saw the Father and Jesus Christ in the year 1829. Joseph Smith received the lesser priesthood(Aaronic priesthood) from them and later received the greater priesthood(Melchizedek) from the inner circle apostles. Now they are also trinitarians like me but Paul taught me that no man has ever or can see God. *1 Timothy 6:16* >***who alone has immortality, who dwells in unapproachable light, whom no one has ever seen or can see. To him be honor and eternal dominion. Amen***. but then Joseph Smith saw the Father and Jesus Christ in a vision, how do hey reconcile what Joseph Smith said and this verse?