Add Video file in requiredFile.xml

I’m trying to config Xibo Client to play video(.mp4) for my project. But it keeps alert this error: “There is an error at XML document: (1, 2)”. I don’t know what file represent for 1, 2.
I also notice in XIbo Documentation that Video is a library file it will be played through requiredFile. I have tried but false. Is there anyone have an example of requiredFile Video.
Thank you.

You cannot manually modify requiredFiles.xml.

If you want the Player to show a video, upload it to the CMS, put it on a layout and schedule it to play on the Player. The system will deal with downloading and playing it for you.