When I added userstamp to my project, I started getting errors like this when active_scaffold tried to render a create form:

ActionView::TemplateError (undefined method `creator_id' for #) on line #7 of vendor/plugins/active_scaffold/frontends/default/views/_form_attribute.html.erb:

Note that the create form being rendered was for a model called Content, which was marked stampable and has the required columns.

Tag doesn't have the userstamp columns and is not stampable nor a model_stamper.