Code validation with W3C

I did the archive views.
Administration > Design > Custom Breadcrumbs I put
Title

The navigation breadcrumbs is OK: Home > Archive > 2010

The W3C validator says:
Line 185, Column 127: syntax of attribute value does not conform to declared value
…iv class="breadcrumb">Home » The value of an attribute contained something that is not allowed by the specified syntax for that type of attribute. For instance, the “selected” attribute must be either minimized as “selected” or spelled out in full as “selected="selected"”; the variant “selected=""” is not allowed.

Line 185, Column 165: syntax of attribute value does not conform to declared value
…" class="">Home » Archivio studenti The value of an attribute contained something that is not allowed by the specified syntax for that type of attribute. For instance, the “selected” attribute must be either minimized as “selected” or spelled out in full as “selected="selected"”; the variant “selected=""” is not allowed.

Same error with the path and taxonomy term.

Can you help me to correct?
In Italy School sites must pass W3C validation auto, otherwise I can't publish.
Thank you