Invalid FORMATETC structure

I'm using VS 2008 and aspNet3.5. Whenever I attempt to add a new ajax control, I get the following error:
The operation could not be completed. Invalid FORMATETC structure. Do you know how to fix this? Thanks.
John AccountAsked:
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Randy PetersonConnect With a Mentor Commented:
You can try some solutions here: http://forums.asp.net/t/958506.aspx

They mention about making the control public, or just exiting out and back in again.

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ayasrebiCommented:
I did the folllowing steps and it worked:
1- Upgraded AjaxControlToolkit to May 13 2003 version
2- Simply checkedout the entire solution and then tried adding the control again
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