My lightroom classic has been fine. Today, I cannot open up my smart folders though! Help!

I'm guessing that you mean smart collections. (LrC does not have a feature named "smart folders")

Please provide details.

What happens when you try to view a smart collection?

A screenshot of the Library module that illustrates the problem might help troubleshooting.

Do not attach the screenshot, use the Insert Photos button in the toolbar to embed it in your post.

Hi, thanks for reaching out! Would you mind sharing the version of Lightroom Classic you're working on along with your computer's macOS version? Are you getting an error or prompt when trying to access the smart folder? Have you made any changes to the folder recently or have there been any recent updates?