Hi @jessicaperezweb, sorry to hear about the trouble.
It sounds like perhaps the selected Facebook page has a Catalog associated with it, but you don’t have the correct permissions for that Catalog so can’t select it.
Please go to the Facebook settings here, and check the People/access settings for the Catalog (under Data sources) as well as the page — make sure the user you are under has full access/permission: https://business.facebook.com/settings/pages/
You could also try removing the existing Catalog, then starting fresh and creating one in the Facebook for Woo setup process:
Image: https://d.pr/i/EbLmc8
If you are still having issues, it could be worth reaching out to FB Merchant support to ask about the permissions/ownership of the pages/catalog:
https://www.facebook.com/help/contact/552096935652452
Other users have had success deleting the old catalog before creating a new one.
Please let me know how that goes, or if you have any questions!