Error?

Today these gents could be seen on the path behind our house. Looks quite impressive, especially considering the remoteness where we live and the peaceful rurality. Was this perhaps an error?
Well, it had to do with an error indeed. They were playing a role in a new film from Frank Schraml. His previous one is called Irrtum - Der Film (in English: Error - The Film). That film plays at least partly in our village too, e.g. a drone filmed the village from above.
These SEK officers (special task force) must have stormed house and office of our neighbour, a tax consultancy in real life.