24 Apr 2010
25 May 2011
Link to this post
I'm having virtually the same error.
Currently there is 2 BlogPosts controls on the page, which is causing the error mentioned above. Removing 1 of the controls fixes the error, but we need both to be displayed.
I tried the fix mentioned above (commenting out the <sfWeb:HeaderLinks id="headerLinks1" runat="server" /> line), however that did not work.
Any ideas on how to fix this? We just switched our site to .NET 4.0, and this was working before.