TF259642: Environment is not ready to run tests because either a compatible version of the test agent is not installed on ...

TF259642: Environment is not ready to run tests because either a compatible version of the test agent is not installed on the machines of the environment, or the test agent account does not have permissions to connect to the test controller. Fix the permission issues by either configuring the lab service account on the test controller, or by following the guidance in http://go.microsoft.com/fwlink/?LinkId=254559, and then Click 'Repair/Install Agents'.