Why am I seeing the error 'Invalid title (special characters not allowed)' when publishing my products?

Why am I seeing the error 'Invalid title (special characters not allowed)' when publishing my products?

Etsy only allows specific characters in product titles. You can use one '%' symbol, one '&' symbol, and one ':' symbol, but special characters like '$', '^', and '`' are not permitted. If your product titles contain any of these invalid characters, update the titles to follow Etsy's guidelines and then try uploading them again from the app.