Problem/Bug I have a problem in plotme permissions

I have a problem in plotme permissions. I already put a permissions

Code:

   - plotme.use.claim
    - plotme.use.auto
    - plotme.use.home
    - plotme.use.list
    - plotme.use.info
    - plotme.use.biome
    - plotme.use.clear
    - plotme.use.dispose
    - plotme.use.deny
    - plotme.use.deny
    - plotme.use.reset
    - plotme.use.add
    - plotme.use.remove
    - plotme.use.protect 

in the first time its work but in second time it says [PlotMe] Permission denied. why this happen
please Help me ~Thanks.!