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An error occured while attaching module (Dynamicweb.Frontend.Content)

System.NullReferenceException: Object reference not set to an instance of an object.
   at NoZebra.NAP.TecDocSteps.RenderSteps.getGroupsFromTecdoc(Int32 tecDocID) in C:\Code\NAP\nap\NAP.TecDocSteps\RenderSteps.cs:line 570
   at NoZebra.NAP.TecDocSteps.RenderSteps.GetContent() in C:\Code\NAP\nap\NAP.TecDocSteps\RenderSteps.cs:line 244
   at Dynamicweb.Frontend.Content.getModule(DataRow& ParagraphRow)