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Hello @sarahweb,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
This warning occurs when you have a keyword with the opening parenthesis which does not contain the closing parenthesis.
In order to fix this issue, you’ll need to add the closing parenthesis there. You may update the keyword from the post/page if you can remember something similar to this one.
Hope that helps.