为什么我的代码不能工作?- setObjectForKey: key is not nil

Working on an app where I store data on Firebase and load the data into my TableView. Had to change the (old) code a little from a tutorial i found so I hope someone can spot the mistake i made. The user can add an event with a: name, date, description (all strings) and Image. This data is loaded into the TableView onto three "labels" and and image on top. Working on an app where I store data on Firebas