Failed attempt to duplicate databse due to bad control file

 Hi,

run {
  allocate channel prmy1 type disk;
  allocate channel prmy2 type disk;
  allocate channel prmy3 type disk;
  allocate channel prmy4 type disk;
  allocate channel prmy5 type disk;
  allocate auxiliary channel stby1 type disk;
  allocate auxiliary channel stby2 type disk;
  duplicate target database
    for standby
    from active database
    dorecover
    spfile
      parameter_value_convert 'primary','stdby'
      set control_files='/u01/app/oracle/oradata/stdby/control.ctl'
      set db_file_name_convert='/u01/app/oracle/oradata/primary','/u01/app/oracle/oradata/stdby'
      set db_name='stdby'
      set db_unique_name='stdby'
      set fal_client='IPCEBI1'
      set fal_server='IPCEBI2'