Yabee .blend to .egg Not Working

I’m trying to use yabee to export a .blend file to an egg file, although so far it isn’t working.
The egg file only contains one line when exported:

<CoordinateSystem> { Z-up }

Has anyone had this problem before? I’m not setting any options or pressing any buttons besides “GENERATE EGG” at the top.

What sort of content does the .blend file contain? And are you selecting the content while exporting the file?

Sorry for the late reply.

I wasn’t selecting anything when exporting. I feel so stupid.