Hi everyone, thanks for spent time on reading this post. Your help is very appreciated,I try to explain thing below. 

I have an Ubuntu 14.04 instance run Odoo server on AWS EC2.

In the setting of odoo server there are two company: a base company and a second company.

I create a product in base company and by accident set it available in a POS of second company. 

When the session on second company was closed. An error below happen cause the odoo server shutdown. I tried to reboot instance and start the odoo server, postgresql, and nginx server by comand by it does't work ( I don't see any new logs in log file).

The last lines in the log file is below. 

It seem there was a conflict happen in accounting configuration when that product of company sold by another company.

I don't know how to solve the problem, and the shop need to access to odoo server to sell product.  

I really need your help and this forum is the only place that I can count. I appreciate from my heart any comments to help me out.

Thank you a lot 

1954 INFO ? openerp.service.server: Initiating shutdown 2017-03-31 06:47:24,231 1954 INFO ? openerp.service.server: Hit CTRL-C again or send a second signal to force the shutdown.

1954 ERROR ? openerp.addons.bus.models.bus: Bus.loop error, sleep and retry Traceback (most recent call last):

  File "/opt/odoo/odoo9/odoo/addons/bus/models/bus.py", line 168, in run

    self.loop()

  File "/opt/odoo/odoo9/odoo/addons/bus/models/bus.py", line 154, in loop

    conn.poll()

OperationalError: server closed the connection unexpectedly

        This probably means the server terminated abnormally

        before or while processing the request.