so i do the marriage strat but when i enter i get the animation of the elder scroll but i move forward to the ceremony and the elder scroll animation just goes away

what have i done wrong to trigger this fail ?

To trigger marriage, you start at the throat of the world with Paarthunax. You first make a quicksave. Fast travel anywhere, and then quickload. Then fast travel to go to marriage. Do not make any quicksaves or quickloads until the cutscene ends.