VAST error 200, aka Video player expected different ad type, is an error that can be caused when a video player does not expect or support an ad type requested in a bid request. For example, if a skippable ad is sent when a player is only configured to support linear ads, or if a skip offset is longer than expected. To fix the error, the publisher should check for trafficking errors and the buyer should ensure that only specified ad types are sent in a response, and that skippable linear creatives respect the skip offset attribute.