Dataset Rules Visual Error

I have used row-level security successfully with many datasets before but today I got this dataset rules visual error for the first time. I don’t see this error documented anywhere. Does anybody know what it means?

We need more information from you to help you here. Can you please email your dashboard/analysis Id/URL and dataset id/url to the following email address?

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David, this can happen when the row-level security permission dataset is deleted. Can you check if the permission dataset is still available.