I've created a blog section, which saves questions, comments, and replies. One each of these creations, I am trying to save the newly publishing content w/ the member that is creating each one. I've attempted to use this solution here:

http://our.umbraco.org/forum/umbraco-7/using-umbraco-7/57287-How-to-set-the-creator-or-writer-of-a-content-item-in-a-controller-action

, but this did not work, as I receive this exception:

Message":"An error has occurred.","ExceptionMessage":"Object reference not set to an instance of an object.","ExceptionType":"System.NullReferenceException","StackTrace":"   at Umbraco.Core.Services.UserService.GetProfileById(Int32 id) line 511\r\n   ..........

Can we not save newly created content as a MEMBER (not user)?

            var cs = new ContentService();
        IPublishedContent node = Umbraco.TypedContent(model.Id);

        if (node != null)
        {
            IContent newPost = cs.CreateContent(postName, node.Id, model.PostType);
            newPost.SetValue("comment", model.Comment);

            //  Id is 2195 and has all of the member data in there
            cs.SaveAndPublishWithStatus(newPost, Members.GetCurrentMember().Id);

        }

We're using Umbraco version 7.2.0 assembly: 1.0.5500.16261