"Invalid Token" Error Message

An invalid token means that a variable doesn’t exist for this product. The error message says that you have two variables (or even just numbers with only a space between them) next to each other without a sign in between them.

And it works best if you go fix them all at once and then hit save. If you fix one error and then save, the page has a hard time saving your changes because there are still broken formulas on the page.