configuration check-out failed

Hi all,

Any  idea why it says "configuration check-out failed"

#deactivate class-of-service drop-profiles extreme-queue-save

{master:0}[edit]
ex# show | compare
[edit class-of-service drop-profiles]
! inactive: extreme-queue-save { ... }

{master:0}[edit]
ex# commit confirmed 2
[edit class-of-service schedulers sched-best-effort drop-profile-map loss-priority high protocol tcp drop-profile]
'drop-profile extreme-queue-save'
drop profile undefined: extreme-queue-save
error: configuration check-out failed -------->?

{master:0}[edit]
ex# show | compare
[edit class-of-service drop-profiles]
! inactive: extreme-queue-save { ... }

{master:0}[edit]
ex#

Tm