We're sorry that you're experiencing this type of issue. Please check your internet connection and update the app to the latest version. You can also restart your device and log into the app again; or contact Google Play or Apple Store (our payment processing providers) to check that your account is active.
If the above three steps don’t work, please contact our customer service directly with supplying us your user id and the screenshot of error message, our support team will answer you as soon as possible. Thank you