This category contains pages transcluding Template:Sfn (talk) with unknown parameters (undefined, misspelled, etc.).

Pages are typically sorted alphabetically by the unknown parameter that is used, e.g. pages using unknown parameter |foo= will be sorted under "F". The name of the page is typically used as a secondary sort key. See additional information from the Parameter usage report for Template:Sfn.

To find the error in a given page, preview the page in edit mode and look for Preview warning: Page using Template:Sfn with unknown parameter "XX"

This tracking category is also applied by {{Sfnp}}.