The main storyline quest "Lord Errant" seems to be stuck for me - I was wandering around with a party member and she kept walking when I stopped in the cutscene. After the cutscene, I was still in the spot that I had started in, and it said that a party member was too far away.

Now, however, I can't seem to do anything about this. The map shows NPCs that I should be talking to, but they're in an inaccessible area, on the map but off of any visible terrain. I've walked around trying to find a way into the area, but there doesn't seem to be one.

How can I go about finishing this quest?