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Open variables window - Object reference not set to an instance of an object.

Question asked by msm on Feb 4, 2018

I have workflow engine 2010, and when I tried to open variables window

 

 

 

I got the following error:

 

 

 

System.NullReferenceException: Object reference not set to an instance of an object.
at Nintex.Workflow.ReservedVariableNames.BuildValidationFunction()
at Nintex.Workflow.ApplicationPages.Activities.StartData.Page_Load(Object sender, EventArgs e)
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase.OnLoad(EventArgs e)
at Microsoft.SharePoint.WebControls.LayoutsPageBase.OnLoad(EventArgs e)
at Nintex.Workflow.ServerControls.NintexLayoutsBase.OnLoad(EventArgs e)
at Nintex.Workflow.ApplicationPages.Activities.StartData.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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