UserFormsColumnCleanTask can't be found

[elkebe]

If you try to run http://yoursite/dev/tasks/UserFormsColumnCleanTask as per the documentation, you get the message:
'The build task "UserFormsColumnCleanTask" could not be found'

If you navigate to http://yoursite/dev/tasks/ and click on 'run task' button under the heading UserForms EditableFormField Column Clean task, MigrationTask is run instead.