HTML 5 Error - The select element cannot have...

Dear Validator,

Error Message - "The select element cannot have more than one selected
option descendant unless the multiple attribute is specified."

This error occurs at *Line 462, Column 81 -*
[See:
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.elementary-group-standards.com%2Findex.php%3Fid%3D564&charset=%28detect+automatically%29&doctype=Inline&group=0
]

The Validator has not made allowances for multiple "Optgroup" elements
having multiple option elements being "selected". In my case, it is the
second and third "Optgroups" which are causing invalidity.

Yours,

Sean Fraser