Keith:

Mine works fine in 2018 and 2019.
I struggled with video creation awhile back until I got set straight by "the Man" himself, Peter Gannon.
There are a couple of "gotchas" you might try:

- after you click the "Save As" icon on the toolbar, and select "Save as video ... ", after the
"Make chordsheet video" window opens, use CTRL+T to remove the large toolbar

- then after the video is created and the "Show video file" button is active, CLOSE BIAB before trying to play the video.

If you still get the error message using this process, sorry, you'll need more help than I can offer.

Good Luck!
LLOYD S