I've got very frustrating problem. During Silver Hand Quest I need to meet Skjor by the Underforge at night. He's there, standing along with Aela who's trying to open the door but can't. I can't open it myself. I've also tried to start the quest from the start, leaving Whiterun, talk to every Companion, reset quest through the console... Nothing.
Also tried to advance through the quest by entering setstage C03 stage but it says:

"unknown variable 'stage' for parameter Stage"
"Compiled script not saved!".

Can anyone please tell me what to do with this? Thanks.