Ubuntu can't restart supervisor [closed]

I tried:

sudo service supervisor restart

I got:

Job for supervisor.service failed because the control process exited with error code. See "systemctl status supervisor.service" and "journalctl -xe" for details.

Then I run:

systemctl status supervisor.service

Result:

supervisor.service - supervisord - Supervisor process control systemLoaded: loaded (/etc/systemd/system/supervisor.service; enabled; vendor preset: enabled)Active: failed (Result: exit-code) since Sun 2018-04-29 13:37:02 EDT; 27s agoDocs: http://supervisord.orgProcess: 23929 ExecStart=/edx/app/supervisor/venvs/supervisor/bin/supervisord --configuration /edx/apApr 29 13:37:02 vu supervisord[23929]:     handlers.append(RotatingFileHandler(filename,'a',maxbytes,baApr 29 13:37:02 vu supervisord[23929]:   File "/edx/app/supervisor/venvs/supervisor/local/lib/python2.7Apr 29 13:37:02 vu supervisord[23929]:     FileHandler.__init__(self, filename, mode)Apr 29 13:37:02 vu supervisord[23929]:   File "/edx/app/supervisor/venvs/supervisor/local/lib/python2.7Apr 29 13:37:02 vu supervisord[23929]:     self.stream = open(filename, mode)Apr 29 13:37:02 vu supervisord[23929]: IOError: [Errno 13] Permission denied: '/edx/var/log/supervisor/Apr 29 13:37:02 vu systemd[1]: supervisor.service: Control process exited, code=exited status=1Apr 29 13:37:02 vu systemd[1]: Failed to start supervisord - Supervisor process control system.Apr 29 13:37:02 vu systemd[1]: supervisor.service: Unit entered failed state.Apr 29 13:37:02 vu systemd[1]: supervisor.service: Failed with result 'exit-code'.