Open Stack

I tried to update an existing stack by just changing a parameter setting
the number of server groups but it failed due to exceeded server group
quota.
I then tried to delete the stack but it failed, heat-engine.log show the
following error

2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource Traceback (most
recent call last):
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource File
"/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 770, in
_action_recorder
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource yield
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource File
"/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 1707, in
delete
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource *action_args)
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource File
"/usr/lib/python2.7/site-packages/heat/engine/scheduler.py", line 352, in
wrapper
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource step =
next(subtask)
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource File
"/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 823, in
action_handler_task
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource done =
check(handler_data)
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource File
"/usr/lib/python2.7/site-packages/heat/engine/resources/stack_resource.py",
line 549, in check_delete_complete
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource return
self._check_status_complete(self.DELETE)
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource File
"/usr/lib/python2.7/site-packages/heat/engine/resources/stack_resource.py",
line 415, in _check_status_complete
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource action=action)
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource ResourceFailure:
resources[0]: resources.pairs.Resource DELETE failed: resources.core: Stack
DELETE cancelled
2017-12-18 23:34:37.755 10017 ERROR heat.engine.resource

Which is strange because all other stack command succeed

Any idea what could cause this problem
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