I need help trigger aodh alarm to execute a simple function. I am following the instructions here but it does't work.

Here are my system configurations:

1- Operating system (Ubuntu16 server) -> running on virtual machine

2- Devstack local.conf file.

3- Devstack Stein release.

Note: I tried to install Devstack on Ubuntu16 desktop and Ubuntu18 desktop but no luck. This link is the error output screen I received during the installation on Ubuntu18 desktop.

Thank you in advance.

Best Regards.