Thanks for your reply.
Still I was not able to solve the issue, can you elaborate the solution. My pages are full of frames.
I didn't get this error in CF 9.
Thanks for your support
Open a browser and go to one of the pages that experiences this issue (just the page as it is before going anywhere else).
In another browser instance, use the link I provided for the HTML Validator. When this page loads, you can either:
A) copy the URL from the first browser and paste it into the URI (URL) field under the URI tab, and click the button, or
B) do a "View Source" for the first browser, copy all of the generated HTML from that into the textarea of the validator site under the "direct input" tab, and click the button.
This will parse all of the code, and point out things like deprecated tags, CSS issues, and other HTML issues that may be causing you problems.
Frames, IMHO, are a no-no, these days. IFRAME can be beneficial, but don't over use them. If your site is, as you say, "full of frames", then I respectfully suggest that the project you are working on is not designed well, and I recommend a redesign that does not use frames. Especially when CF can dynamically load content into the DOM via CFDIV, and jQuery can do the same using AJaX.