Files with non-latin filenames (like File:동곡마을 태을선.jpg) can't be imported.
The URL to this file looks like this:
https://commons.wikimedia.org/wiki/File:%EB%8F%99%EA%B3%A1%EB%A7%88%EC%9D%84_%ED%83%9C%EC%9D%84%EC%84%A0.jpg
FileImporter complains The requested page title contains invalid characters: "%EB".