The error is caused by the fact the Live Update, for some reason, hasn't been able to download the new jetway model we posted a couple of days ago following user suggestions to have one with texture more suited to the scenery.
This is not normal, of course, since I verified the Live Update correctly downloads the jetways so, there must be some problem in your system, maybe related to a firewall or antivirus blocking the Live Update from downloading files.
Try to remove this folder, and start the Live Update:
%APPDATA%\Virtuali\UpdateCache