This Error occurs when adding a wepart to page or changing webpart from one zone to another zone because the webpart is disposing the spsite or spweb object. If your code looks like below:
using (SPWeb web = SPContext.Current.Web)
{
//some coded here
}
Change it to the format below:
SPWeb web = SPContext.Current.Web;
// your code here
And the Exception (Exception from HRESULT: 0x80020009 (DISP_E_EXCEPTION)) should be resolved.
