I am trying to add an assembly to configuration/system.web/compilation/assemblies - but with the following code it I get Expression must evaluate to a node-set.

private SPWebConfigModification CreateWebModificationObject()
        string strUniqueName = string.Format("add [@assembly='{0}']", typeof(HowsYourDayHub).AssemblyQualifiedName);
        string strNode = "configuration/system.web/compilation/assemblies";

        SPWebConfigModification webConfigModification = new SPWebConfigModification(strUniqueName, strNode)
                Owner = "HowsYourDay",
                Sequence = 1,
                Type = SPWebConfigModification.SPWebConfigModificationType.EnsureChildNode,
                Value = string.Format("<add assembly='{0}' />", typeof(HowsYourDayHub).AssemblyQualifiedName)

        return webConfigModification;

1 Answer 1


Okay I found a solution with a console app - seems like a previous modification was stuck:

            SPWebApplication webapp = site.WebApplication;


after clearing every modification it started working!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.