I was installing Ceilometer using this guide: http://docs.openstack.org/developer/ceilometer/install/manual.html

After I have finished everything, I try to test it by using: ceilometer meter-list and it gives me this error: HTTPInternalServerError (HTTP 500)

Heres what I have on the log:

    root@iaas-hk01:/etc/apache2/sites-enabled# tail -f /var/log/apache2/ceilometer_error.log
    [Wed Jul 24 18:35:48 2013] [error]   File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 80, in connect
    [Wed Jul 24 18:35:48 2013] [error]     return dialect.connect(*cargs, **cparams)
    [Wed Jul 24 18:35:48 2013] [error] 
    [Wed Jul 24 18:35:48 2013] [error]   File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 281, in connect
    [Wed Jul 24 18:35:48 2013] [error]     return self.dbapi.connect(*cargs, **cparams)
    [Wed Jul 24 18:35:48 2013] [error] 
    [Wed Jul 24 18:35:48 2013] [error] OperationalError: (OperationalError) unable to open database file None None
    [Wed Jul 24 18:35:48 2013] [error] 
    [Wed Jul 24 18:35:48 2013] [error] [client 192.168.10.16] mod_wsgi (pid=2178): Exception occurred processing WSGI script '/opt/stack/ceilometer/ceilometer/api/app.wsgi'.
    [Wed Jul 24 18:35:48 2013] [error] [client 192.168.10.16] Typ

eError: expected byte string object for header value, value of type int found

I hope someone who could guide me how to fix this.