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Setting a custom lookup field using designer workflow error RRS feed

  • Question

  • Hi,

    I am using Project Server 2013 with a SharePoint workflow. What I am trying to do is to set the value of a custom field that reads its values from a lookup table (this field will show users as options to select from). In the SharePoint workflow, there is an option to set a project field and I am using it. I selected this action and I have selected my field "Name" as the project field and a workflow lookup value as the value that will be assigned.

    My problem is that when I publish the workflow and start it, it will suspend in this stage with the following message:

    " Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ArgumentNullException: Value cannot be null. Parameter name: Input at Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext context) at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)"

    As you know, there are two options to assign a value to a custom lookup filed, one is to select a value from a drop down (shows the lookup table values) and the other is to use a workflow lookup value. When I select a value from the drop down, the workflow works perfectly but when I use the workflow lookup value it gives me this error.

    I would like to understand why I am receving a null error when I am assigning a value using the  approach.

    Thank you in advance for your support.


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    Tuesday, December 4, 2018 10:45 AM