You seem to be accessing the Mileage Capture site more than once by opening another browser tab or window
Accessing the site more than once is not supported as logging in again will invalidate your first tab / window, which will result in errors when you return to it. Therefore it is recommended you close the second window or tab and not continue any further. If you believe this is incorrect then press the login button below. This will transfer you to login page and will safely clear any previous sessions and your login will start afresh.