Cant join the Sunken Temple ( Error (2) (17))

Whenever i join the sunken temple i only get a black screen with the loading symbol.... but i can chat with the other people in the instance. If i wait a little bit i get the unexpected error (2) (17) and im kicked out of the game. All other instances i visited up until now worked fine... can anyone help me?

anyone? :/

Now the same thing happens in The Stone Vigil too.... but Cutters Cry worked fine... tried to update my drivers already and it didnt help...