Many people have been facing this issue after the community version release of Automation Anywhere.
There is no need to worry. You can solve this issue in no time.
Press Ctrl+R to open the Run window and just type services.msc and from the list of services mentioned, search for Automation Anywhere Client service.
In the status column, check if the service is running if it is not then just right click and click on the start option.
This will just take a few seconds to start the service and if you see the running status then you are good to go.