Error:

The Web application at http://site/Forms/AllItems.aspx could not be found. Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application.

at Microsoft.SharePoint.SPSite..ctor(SPFarm farm, Uri requestUri, Boolean contextSite, SPUserToken userToken)

at Microsoft.SharePoint.SPSite..ctor(String requestUrl)

at MOVE.FormCode.CTRL1_5_Clicked(Object sender, ClickedEventArgs e)

at Microsoft.Office.InfoPath.Internal.ButtonEventHost.OnButtonClick(DocActionEvent pEvent)

at Microsoft.Office.Interop.InfoPath.SemiTrust._ButtonEventSink_SinkHelper.OnClick(DocActionEvent pEvent)

/error

I spent the better part of week working on this error. The problem was related to my trying to use InfoPath Forms when I should have been using Browser enabled forms. Once I published the  form and uploaded into to Central Administration I was able to use Managed Code.