I have the same exact problem:
System.ApplicationException : Exception thrown attempting to launch Internet Explorer. Please make sure Internet Explorer is properly installed and you are able to launch it. Also make sure that WebAii Test Execution client is properly installed. Check Tools->Manage Add-ons.
----> System.NullReferenceException : Object reference not set to an instance of an object.
And this is just with the sample NUnit SampleWebAiiTest.
This error is thrown when calling Manager.LaunchNewBrowser(BrowserType.InternetExplorer);
The tests executes as expected with Firefox and Chrome.
I also noticed that the WebUI Test Execution Client extension was clearly installed on Firefox,
but that extension is missing in my IE 8
I've tried uninstalling/reinstalling WebAii framework,
I've configured IE 8 as outlined here
, and uninstalled/reinstalled once more, and still getting the same error.
Is there anyway I can install this WebAii Test Execution client for IE, because I've even noticed that when browsing the installation folders (C:\Program Files (x86)\Telerik\WebAii Testing Framework 2010.3\Browser Extensions) I noticed that there were sub folders for Chrome, Firefox, and Safari...but no IE!