Category:CS1 errors: empty unknown parameters

This category is not shown on its member pages unless the appropriate user preference is set.

This category may be empty occasionally or even most of the time. Administrators: Please do not delete this category even if it is empty.

Problems caused by parameter names include using a previous name instead of a new name. The error Cite has empty unknown parameter: |1= may be caused by an empty, unnamed parameter |}}, particularly at the end of the reference.