Hi,
I was getting the above error while trying to hosting the SharePoint 2013 online web part page inside an iframe within CRM’s Form.
The following post came to the rescue
http://blogs.msdn.com/b/officeapps/archive/2012/12/12/iframing-sharepoint-hosted-pages-in-apps.aspx
specifically the following tag
<WebPartPages:AllowFraming runat=”server” />
Hope it helps.
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uncheck the option “Restrict cross-frame scripting where supported” in the Iframe where you added the HTML page/any web resource
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