getting error as Edge is running in the background and cannot be closed

Make sure that all instances of Edge are closed at the end of each test run.  

Check the Test Extension and make sure it is installed and enabled.

Test Extension is installed and available, we are closing broser at the end of each test run however still it is throwing this error. Any one else has faced simialr issue. 

Closing the browser may not be enough. I bet there are still instances of Edge if you look in Task Manager.  

See if this helps

https://support.smartbear.com/testcomplete/docs/app-testing/web/general/common-tasks/closing-browsers.html

As Marsha_R has mentioned, check your Task Manager. Edge has settings to run in the background,