unable to transform to artboard

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.

<moved from using the community>

Just do what it says:

Select a rectangle that is not rotated and not a clipping mask.

So: what did you select? Can you show a screenshot that includes the layer panel?

is this an illustrator question or, if not, what adobe app?