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500 internal server error while accessing horizon dashboard (ocata) in Centos 7.6

Hi everyone,

After following the OpenStack Ocata guide, now i'm in the step of access the dashboard for the first time but every time i try to access horizon this message shows up: 500 error

I have checked the /var/log/httpd/error_log I got the bellow errors :

[root@controller ~]# tail -f /var/log/httpd/error_log

[Mon Dec 10 16:45:29.928726 2018] [:error] [pid 20929] [remote 172.16.9.44:172] '.secret_key_store'))

[Mon Dec 10 16:45:29.928730 2018] [:error] [pid 20929] [remote 172.16.9.44:172] File "/usr/lib/python2.7/site-packages/horizon/utils/secret_key.py", line 76, in generate_or_read_from_file

[Mon Dec 10 16:45:29.928739 2018] [:error] [pid 20929] [remote 172.16.9.44:172] with lock:

[Mon Dec 10 16:45:29.928743 2018] [:error] [pid 20929] [remote 172.16.9.44:172] File "/usr/lib/python2.7/site-packages/fasteners/process_lock.py", line 174, in __enter__

[Mon Dec 10 16:45:29.928752 2018] [:error] [pid 20929] [remote 172.16.9.44:172] self.acquire()

[Mon Dec 10 16:45:29.928756 2018] [:error] [pid 20929] [remote 172.16.9.44:172] File "/usr/lib/python2.7/site-packages/fasteners/process_lock.py", line 151, in acquire

[Mon Dec 10 16:45:29.928762 2018] [:error] [pid 20929] [remote 172.16.9.44:172] self._do_open()

[Mon Dec 10 16:45:29.928766 2018] [:error] [pid 20929] [remote 172.16.9.44:172] File "/usr/lib/python2.7/site-packages/fasteners/process_lock.py", line 123, in _do_open

[Mon Dec 10 16:45:29.928773 2018] [:error] [pid 20929] [remote 172.16.9.44:172] self.lockfile = open(self.path, 'a')

[Mon Dec 10 16:45:29.928790 2018] [:error] [pid 20929] [remote 172.16.9.44:172] IOError: [Errno 13] Permission denied: '/usr/share/openstack-dashboard/openstack_dashboard/local/_usr_share_openstack-dashboard_openstack_dashboard_local_.secret_key_store.lock'

Please help me to fix this proplem. Thank you so much !