If you see a screen similar to this (and your system has been installed and setup by All Tech Plus) check that you have the web server running which is also responsible for starting the database server. If you have only just started the web server (if it isn't set to automatically start) or just started your computer, at this point press exit, wait about 10 seconds and try to launch Chromis again.

I have found that 'Retry' doesn't typically work.

If your system has not been installed and setup by All Tech Plus, exit, wait a short time and try again. If you still get the error you will need to check that the MySQL server (if your installation is using MySQL that is) is running. If you are not sure where your MySQL server is you can of course check configuration to make sure it is setup correctly. If this is too complicated for you then contact your support department or installer.