--output is not working properly

[WeWin55]

Hey,

Im trying to download a video:
I have f bestvideo[height<=?1080]+bestaudio/best in my settings conf.
Here is my script:
youtube-dl -w --output '%(uploader)s %(title)s %(resolution)s' --write-thumbnail "https://www.youtube.com/watch?v=mA9B3I44BHg"

I starts downloading, but after the avconv warning it says:

ERROR: Best of PietSmiet QUICKY # 99 - Rage Mode - Deactivated «» Best of PietSmiet _ HD 1920x1080.temp: Invalid argument

I dont know what to do.

[dstftw]

Duplicate of #5535.
For now you have to append an extension to output template: -o %(uploader)s %(title)s %(resolution)s.%(ext)s.