Layout sondard was not found.

[Mark Kortink]

When I open one on my LyX articles I get the message "Layout `sondard' was 
not found." I have never used or heard of this layout, and the only 
package the document uses is "xy" for xypic (Document Class is an American 
Mathematical Society Book). Once I close the dialog everything works fine.
How can I get rid of this annoying message?

Thanks