Guild Wars 2

I tried to finish up the achievement for completing 10 Nightmare Chambers for The Nightmares Within and I can’t enter the Nightmare Chamber. I got an error “InstanceCreate failed. Error=42; Product=5; Module=18; Line=274”. I got the error message only on the first time I tried to enter the chamber, but I have tried repeatedly to enter it and can’t get in. And yes, it is the active chamber on this level (level 1).

I then went to the active chamber on level 2, which happened to be the one at the travel golem at the end of level 2/beginning of level 3, and that one is not functioning either.

Update: On the first one I encountered there was another player who also could not get in. On the second one, while I was composing this post, another player ran past me and into the chamber. I tried logging out and coming back in and got into the chamber. So, if this happens to you, try logging all the way out and trying again.