You need to have a navigation step at the beginning of the test in order to open the page and execute the rest of the recorded steps (see screenshots).
Please check out this video to see how it works http://screencast.com/t/cehZM7r4d
. As you can see, first time I've run the test without the Navigate Step, and the test failed with a blank page. Then I've added a Navigate Step as first step in the test and the Google page is displayed as expected.
Please try it and let me know if you still have problems running your tests!
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