I said that because I was asking to myself if it was not related to your pb. Once you select a search result, we should see the video in the video match area.
Definitely related - it can't see the video to match to. If it can find the video it looks like this: Probably something to do with the filename.
OK, error only showed up when I selected TVDB as base. Worked OK with TMDB and MazeDB. But msg itself is confusing as hell.