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Error editing a document that is running a workflow

Posted By:      Posted Date: September 06, 2010    Points: 0   Category :SharePoint
After workflow is started i try edit document, but this error is displayed: System.ArgumentNullException: Value cannot be null.  Parameter name: s     em System.IO.StringReader..ctor(String s)      em System.Xml.XmlDocument.LoadXml(String xml)      em Microsoft.SharePoint.Publishing.Internal.WorkflowUtilities.FlattenXmlToHashtable(String strXml)      em Microsoft.SharePoint.Publishing.Internal.WorkflowUtilities.DoesWorkflowCancelWhenItemEdited(String associationXml)      em Microsoft.SharePoint.Publishing.WebControls.ConsoleDataSource.EnsurePageNotInLockingWorkflowIfInEditMode()      em Microsoft.SharePoint.Publishing.WebControls.ConsoleDataSource.LoadDataSource()      em Microsoft.SharePoint.Publishing.WebControls.ConsoleDataSource.OnLoad(EventArgs e)      em Microsoft.SharePoint.Publishing.WebControls.XmlConsoleDataSource.OnLoad(EventArgs e)      em Microsoft.Share.Point.Publishing.WebControls.PublishingSiteActionsMenuCustomizer.OnLoad(EventArgs e)      em System.Web.UI.Control.LoadRecursive()      em System.Web.UI.Control.LoadRecursive()      em System.Web.UI.Control.L

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