Validation error w3c

Hello
After install modules, I have 12 w3c errors...How to solve this? Thanks

Line 2, Column 143: Attribute xmlns:og not allowed here.
…#" xmlns:puertolopez="ogp.me/ns/fb/puertolopez#" lang="es-es" dir="ltr">
Warning Line 2, Column 143: Attribute with the local name xmlns:og is not serializable as XML 1.0.
…#" xmlns:puertolopez="ogp.me/ns/fb/puertolopez#" lang="es-es" dir="ltr">

Line 435, Column 498: Element name g:plusone cannot be represented as XML 1.0.
…rismo-ecuador/sobre-puerto-lopez.html"></g:plusone></div><link rel="stylesheet…

Error Line 435, Column 498: Element g:plusone not allowed as child of element div in this context. (Suppressing further errors from this subtree.)
…rismo-ecuador/sobre-puerto-lopez.html"></g:plusone></div><link rel="stylesheet…
Content model for element div:
Flow content.

Error Line 435, Column 636: Element link is missing required attribute property.
…sets/jfbconnect.css" type="text/css" /><div class="jfbclike"><div class="fb-li…
Attributes for element link:
Global attributes
href
crossorigin
rel
media
hreflang
type
sizes
Also, the title attribute has special semantics on this element.