This can be caused by a number of problems. If every video you try to watch on our site returns this error, it is a temporary problem caused by our streaming server breaking down from excess usage. During regular business, hours this should only take a few minutes to fix once we are aware of the problem, so check back soon and everything should work.
On the other hand, if you only receive this error for one particular video, then it is possible that the video file has been corrupted, and we would appreciate your feedback so we can fix it.