Warning about not animating a component

I made a first attempt at an animation. Doenet

I’m happy with everything I have, except that off and on while creating it, I kept getting a warning about not being able to animate some component. I switched to the dev version, and that seemed to help, but then I added the rest of the parts for students to answer and now the warning is back. What does the warning mean and what do I need to change?

What do I need to do to trigger the warning? I played with it a little and couldn’t get it to give me the warning.

Ack, I don’t see it now, either! I really don’t understand what the warning is about or why it seems to come and go. I guess I’ll post again if I see it return.

Sorry about that! If you do get the warning, be sure to capture what it says. The only warnings I can find that we create for <animateBySequence> start with: “Invalid target for <animateFromSequence>”. They occur when it can’t find a component to animate from the target attribute.