Help with W3C validation and one error... there is no attribute "itemprop"
I am trying to get my site to pass the W3C Validation, and I have one error remaining on the below page and I am not sure how to resolve it.
Validation URL: http://validator.w3.org/check?uri=ht...Inline&group=0
Page URL: http://www.sightseeingtourslondon.co...ours-c-84.html
The error response is: there is no attribute "itemprop"
Now this comes from adding in rich snippets into the breadcrumb and it all works fine, is there something simple I can do to resolve this error from a validation side - other than remove the rich snippet text.