Not agree with markup validation service

Sergio Pompa <[email protected]>
Newsgroups gmane.org.w3c.validator
Message-ID <CF9C29C5.71C1%[email protected]>
Dear sir/madam,

I have validated my web page ( www.diing.es ) using markup validation
service and i don´t understand the mistakes that the service is marking:


As per my knowledge this is not an error. Could you please explain me where
the mistake is?
I want to use the validation certificate in my web page but I can´t due to
this issue.
Thanks for your help in advance.

Awaiting your soonest reply.

Best regards, 

Sergio Pompa Garvía
Front-End Developer / UX
Móvil: 661 76 15 86
e-mail: [email protected] <mailto:[email protected]>
Sergio Pompa Garvia | LinkedIn
<http://www.linkedin.com/pub/sergio-pompa-garvia/6a/491/975>
@Sergio_Pompa_G <https://twitter.com/Sergio_Pompa_G>
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