document type does not allow element "div" here?

Hello!

I am the webmaster of http://www.frauenportal.net/ - I am trying to validate my website. I used http://validator.w3.org/ and am getting some errors.

The only error I do not understand, is the following:

Line 70, Column 20: document type does not allow element "div" here; missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag

  <div class="logo"></div>

Can somebody please explain me this error?

Thank you!

Sandra
-- 
Neu: GMX De-Mail - Einfach wie E-Mail, sicher wie ein Brief!  
Jetzt De-Mail-Adresse reservieren: http://portal.gmx.net/de/go/demail