TF298030: Cannot start a new testing session on the device '{0}' since a session is already in progress for the user: '{1}'. ...

TF298030: Cannot start a new testing session on the device '{0}' since a session is already in progress for the user: '{1}'. Stop the existing session and then try again. If the problem persists, log in to the device, restart the 'Microsoft Test Tools Adapter' service, and then try again.