Problem: User got Error: "Connection refused: connect" when trying run a test on Windows App.
Reason: User has not installed WinAppDriver or WinAppDriver has not been started.
Before running the test, you need to install and run WinAppDriver on the test machine where you have the Application Under Test. Details documents https://docs.katalon.com/katalon-studio/docs/setup-winappdriver.html#set-up-windows-application-driver-on-a-local-windows-10-machine
Then start the WinAppDriver to start listening on the IP and Port