You tell us nothing about what you did to get this error message.
Tip: To take a screenshot of a dialog use Alt+Printscreen.
Sorry, I thought the readers will catch it from the post title, this is when I try to insert a new glyph by number, a video record was sent to Erwin.
I can reproduce the issue if I insert a new glyph after the last glyph, then Undo.
That is right BP. well done 