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private void createTask1_MethodInvoking(object sender, EventArgs e) { createTask1.TaskId = Guid.NewGuid(); approvalTask_TaskProperties = new SPWorkflowTaskProperties();

        **approvalTask_TaskProperties.AssignedTo = workflowProperties.Web.SiteAdministrators[0].LoginName;**


        approvalTask_TaskProperties.DueDate = DateTime.Now.AddDays(1.0F);
        approvalTask_TaskProperties.Title = "Approval Required for " + twInfo.Title;
        approvalTask_TaskProperties.Description = "Specify the approval result here .";
        createTask1.TaskProperties = approvalTask_TaskProperties;
    }

In the highlighted line I have a problem, It gets Value cannot be null. Parameter name: uriString

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  • I fixed this by placing the following code. private void onWorkflowActivated1_Invoked(object sender, ExternalDataEventArgs e) { XmlSerializer serializer = new XmlSerializer(typeof(TrainingInfo)); XmlTextReader reader = new XmlTextReader(new System.IO.StringReader(workflowProperties.InitiationData)); twInfo = (TrainingInfo)serializer.Deserialize(reader); createTrainingSiteName = twInfo.Code; createTrainingSiteUrl = workflowProperties.WebUrl; } however I get another error, the InitiationData is NULL] Any idea?
    – Luis Valencia
    Commented Sep 3, 2010 at 3:07
  • sergeluca.spaces.live.com/blog/cns!E8A06D5F2F585013!972.entry - See step 7, I think that might help solve your issue.
    – James Love
    Commented Sep 3, 2010 at 7:56
  • The problem was with the onworkflowactivated, it didnt have the properties well binded.
    – Luis Valencia
    Commented Sep 3, 2010 at 15:54

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The problem was with the onworkflowactivated, it didnt have the properties well binded, after I binded them, I got the initiationData not null

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