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I am trying to start a list workflow in SharePoint 2013 using client object model. But while loading WorkflowServicesManager, it throws the error below -

Value cannot be null
Parameter name: uriString

The code I am using is like below :

    public void StartWorkflow() 
    {
        ClientContext ctx = new ClientContext("<site url>");
        ctx.Load( ctx.Web );
        ctx.ExecuteQuery();

        WorkflowServicesManager wfSvcMan = new WorkflowServicesManager( ctx, ctx.Web );
        ctx.Load( wfSvcMan );

        //executing this throws error "Value cannot be null"
        ctx.ExecuteQuery();
    }

Any idea?

  • is it a console app? – Unnie Jul 11 '14 at 11:25
  • Yes, a console app – Bishnu D. Jul 11 '14 at 11:44
  • Check whether the person whose account u r running have adequate permissions on site. – Unnie Jul 11 '14 at 12:16
  • Check whether the person whose account u are running have right on site.Check ctx.web is not null – Unnie Jul 11 '14 at 12:21
  • The user is the Administrator. And have all access to the Site. Also the ctx.Web is not null – Bishnu D. Jul 11 '14 at 15:45

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