Me too, except the message is in English, but I think the error message is the same: Could not load file or assembly MapThumbnailExtractor Version=1.0.0.0 Culture=neutral PublicKeyToken=null or one of its dependencies. The system cannot find the file specified.
This started to happen after trying to update YR to the recent version, and that update failed midways. It said something about it couldn't update some file that existed, or similar.