When trying to restart the openerp server with :

service openerp restart

 here is the error message :

Restarting openerp: start-stop-daemon: warning: failed to kill 8067: No such process
openerp.

And when trying to run the dameon, with : /usr/bin/openerp-server to debug, here is what I'm getting : 

Traceback (most recent call last):
  File "/usr/bin/openerp-server", line 2, in <module>
    import openerp
  File "/usr/lib/pymodules/python2.7/openerp/__init__.py", line 49, in <module>
    import service
ImportError: No module named service
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 128, in apport_excepthook
    os.O_WRONLY|os.O_CREAT|os.O_EXCL, 0o640), 'w')
OSError: [Errno 13] Permission denied: '/var/crash/_usr_bin_openerp-server.115.crash'
Original exception was:
Traceback (most recent call last):
  File "/usr/bin/openerp-server", line 2, in <module>
    import openerp
  File "/usr/lib/pymodules/python2.7/openerp/__init__.py", line 49, in <module>
    import service
ImportError: No module named service

the service folder exists, and it belongs to the openerp user, I don't know why I'm getting this error. 

Help please.