O/D light flashing car wont go into gear. wont shift in to drive or reverse on 2002 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Had transmission repalced about a year ago. and the sleniod something to do with the transmission the year before that .
(1) Answer
I would take it back to where you had the tranny put in