Error When Changing Comment Box

Sorry but I have some questions which are not answered by your screenshots.

It is a software simulation, but I cannot detect which version you are using: is this with Captivate Classic (version 11 or older) or with the new version 12? You find the full version number under Help, About Captivate.

I suspect this simulation is in Training or Assessment mode, which one did you use?

Can you post a screenshot of the Timeline of the slide with the error message?

If this is a non-responsive project (probably) in a Classic Captivate version, which Preview method did you use? Except in version 11.8 the versions have a lot of Preview methods which are no longer valid. You should use only F11, Preview HTML in Browser.

Did you upload the published version ot a webserver to check it out?

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post if it helps you get responses.

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is this an acrobat question?