Closing browser window

When trying to close the current browser window I receive the error posted below.



To close the window I simply call an On Screen Action for



Aliases.browser.BrowserWindow

Close



This used to work, but since I moved to using Run Browser rather than TestedApps it no longer seems to work.



What do I need to do to make this work?

P.s. all my other on screen actions work with "Aliases.browser"



The error:

An error occurred while accessing the "Close" method or property of the "BrowserWindow" object.

The object or one of its parent objects was not found.

Object Whose Method or Property Was Accessed

Object That Was Not Found

Click the link above to view and configure mapping settings for the missing object.

Learn about possible causes of the error