probably managed to break the gate. might need new interlock.
That is, when you take the Riv out of park as you know you have to step on the brake to release the interlock. I imagine you can get it our of park without foot on brake but it would be really hard and you would break the shifter - which is what I suspect happened to you this time.
I suggest contacting Ed Morad for parts to replace the innards of the shifter in the floor console. Ed has a bunch of Rivs in recently, should not be a big deal.
Albertj