Have had this happen to me a few times. Usually from unwinding too fast on the profulr motor
and not keeping enough tension on the outhaul
. Got so stuck once I thought it would never come out. But kept watcing the slot and working the sail back and fourth and manually pulling down and out on the foot of the sail until it worked out.
I agree with Blue Stocking and have made that mistake too - uneven tension when being rolled up causing folds/kinks in the sail fabric
on the roll.
It will come out. Good luck.