Move the door to both sides and look at the UPPER track. Make sure there is nothing in it to prevent the door from moving fully up into the slot. There may be screw heads or other impediments to the door moving all the way up.
From the outside.... move the door to the center of the range and try again. Lift it up as far as it will go, then pull out on the bottom of the door. It should come out. Somebody got it in, didn't they?
If it absolutely will not come out, you'll have to (at least partially) remove the frame. It's not too difficult or complicated.

if you can try lowering the rollers then it may clear the track.

Of course. Thanks AWINDORMAN. I forgot, the rollers may have been adjusted far enough out to keep you from removing the door. Adjust them "into" the door as far as they will go. The door should come out.