Why tuned produces "usb_autosuspend: command not found" error while changing profile with "tunedadm" tool in RHEL6?

Issue

• While attempting to change tuned-adm profile to spindown-disk I see an error message enable_usb_autosuspend: command not found.

• There are two subsequent error messages as well. I would expect these scripts to be quiet about things that are not important (and log them to syslog or some such):

[root@locakhost]# tuned-adm profile spindown-disk
Reverting to saved sysctl settings:                        [  OK  ]
Calling '/etc/ktune.d/tunedadm.sh stop':                   [  OK  ]
Reverting to cfq elevator: dm-0 dm-1 dm-2 dm-3 dm-4 dm-5 sd[  OK  ]c sdd sde sdf sdg sdh sdi sdj sdk sdl sdm sdn sdo sdp sdq sdr sds sdt sdu sdv sdw sdx sdy sdz 
Stopping tuned:                                            [  OK  ]
Switching to profile 'spindown-disk'
Applying ktune sysctl settings:
/etc/ktune.d/tunedadm.conf:                                [  OK  ]
Calling '/etc/ktune.d/tunedadm.sh start': /etc/ktune.d/tunedadm.sh: line 12: enable_usb_autosuspend: command not found
Can't get device info: No such device
ERROR: Module hci_usb does not exist in /proc/modules
                                                           [  OK  ]
Applying sysctl settings from /etc/sysctl.conf

Starting tuned:                                            [  OK  ]
[root@localhost]#

• Why are these errors seen while changing profiles?