You assigned substitution profile 0001 which is disciplinary or something like that - this substitution profile has no meaning and is only an example. try not assigning a substitution profile or use profile 'all' which contains the 'NO_CLASS' task class which is the default classification for tasks in the system.
you can see substitution definition in SAP Web Application Server→Business Management→SAP Business Workflow→Basic Settings (Organization Management)→Substitute Profile.
see also: Maintaining and Activating Substitutes (SAP Library - SAP Business Workflow)