Please roll back the last update
Latest update broke it. As soon as you pull the tracking, or detailed, it gives an error before you can get to the latest details.
Response from developer
Hi Ms Sunshine 777, We are so sorry to hear that. We would love to know more on the error you getting at your end and assist you as soon as possible. Please write to us at one.mobileapp@one-line.com Regards, Development team