ha  i won get error as below debug nova filters  req b e b bc  admin admin  filter aggregateimagepropertiesisolation returned host s  from  pid get filtered objects  opt stack nova nova filters py error oslo messaging rpc dispatcher  req b e b bc  admin admin  exception during message handling cpu allocation ratio trace oslo messaging rpc dispatcher traceback  most recent call last trace oslo messaging rpc dispatcher file usr local lib python dist packages oslo messaging rpc dispatcher py line in  dispatch and reply trace oslo messaging rpc dispatcher executor callback trace oslo messaging rpc dispatcher file usr local lib python dist packages oslo messaging rpc dispatcher py line in  dispatch trace oslo messaging rpc dispatcher executor callback trace oslo messaging rpc dispatcher file usr local lib python dist packages oslo messaging rpc dispatcher py line in  do dispatch trace oslo messaging rpc dispatcher result func ctxt new args trace oslo messaging rpc dispatcher file usr local lib python dist packages oslo messaging rpc server py line in inner trace oslo messaging rpc dispatcher return func  args kwargs trace oslo messaging rpc dispatcher file opt stack nova nova scheduler manager py line in select destinations trace oslo messaging rpc dispatcher filter properties trace oslo messaging rpc dispatcher file opt stack nova nova scheduler filter scheduler py line in select destinations trace oslo messaging rpc dispatcher filter properties trace oslo messaging rpc dispatcher file opt stack nova nova scheduler filter scheduler py line in  schedule trace oslo messaging rpc dispatcher filter properties  index num trace oslo messaging rpc dispatcher file opt stack nova nova scheduler host manager py line in get filtered hosts trace oslo messaging rpc dispatcher hosts  filter properties  index trace oslo messaging rpc dispatcher file opt stack nova nova filters py line in get filtered objects trace oslo messaging rpc dispatcher list objs list objs trace oslo messaging rpc dispatcher file opt stack nova nova filters py line in filter all trace oslo messaging rpc dispatcher if self  filter one obj  filter properties trace oslo messaging rpc dispatcher file opt stack nova nova scheduler filters init py line in  filter one trace oslo messaging rpc dispatcher return self host passes obj  filter properties trace oslo messaging rpc dispatcher file opt stack nova nova scheduler filters core filter py line in host passes trace oslo messaging rpc dispatcher filter properties trace oslo messaging rpc dispatcher file opt stack nova nova scheduler filters core filter py line in  get cpu allocation ratio trace oslo messaging rpc dispatcher  cpu allocation ratio trace oslo messaging rpc dispatcher file opt stack nova nova scheduler filters utils py line in aggregate values from key trace oslo messaging rpc dispatcher aggregate vals set aggr metadata key name  for aggr in aggrlist trace oslo messaging rpc dispatcher file opt stack nova nova scheduler filters utils py line in  genexpr trace oslo messaging rpc dispatcher aggregate vals set aggr metadata key name  for aggr in aggrlist trace oslo messaging rpc dispatcher keyerror cpu allocation ratio trace oslo messaging rpc dispatcher error oslo messaging  drivers common  req b e b bc  admin admin  returning exception  cpu allocation ratio  to caller error oslo messaging  drivers common  req b e b bc  admin admin  traceback  most recent call last n file usr local lib python dist packages oslo messaging rpc dispatcher py line in  dispatch and reply n executor callback n file usr local lib python dist packages oslo messaging rpc dispatcher py line in  dispatch n executor callback  n file usr local lib python dist packages oslo messaging rpc dispatcher py line in  do dispatch n result func ctxt new args  n file usr local lib python dist packages oslo messaging rpc server py line in inner n return func  args kwargs  n file opt stack nova nova scheduler manager py line in select destinations n filter properties  n file opt stack nova nova scheduler filter scheduler py line in select destinations n filter properties  n file opt stack nova nova scheduler filter scheduler py line in  schedule n filter properties  index num  n file opt stack nova nova scheduler host manager py line in get filtered hosts n hosts  filter properties  index  n file opt stack nova nova filters py line in get filtered objects n list objs list objs  n file opt stack nova nova filters py line in filter all n if self  filter one obj  filter properties n file opt stack nova nova scheduler filters init py line in  filter one n return self host passes obj  filter properties  n file opt stack nova nova scheduler filters core filter py line in host passes n filter properties  n file opt stack nova nova scheduler filters core filter py line in  get cpu allocation ratio n cpu allocation ratio n file opt stack nova nova scheduler filters utils py line in aggregate values from key n aggregate vals set aggr metadata key name  for aggr in aggrlist  n file opt stack nova nova scheduler filters utils py line in  genexpr  n aggregate vals set aggr metadata key name  for aggr in aggrlist  n keyerror cpu allocation ratio  n  