Kindly do self troubleshoot as per below and try to relogin after:
1) Logout and re-Login App- if error still persisting proceed to next step
2) Uninstall and re-install App - if error still persisting proceed to next step
3) Restart & update the app
For Android - Swipe up and down or left and right (depending on your phone) and find Touch ‘n Go eWallet app to close it. Re-launch the Touch ‘n Go eWallet app. Then, go to settings -> software updates -> manual update (update your Android OS as required). Next, open Google Play -> My apps & games - > Touch ‘n Go eWallet app (Update the app is there is any new update)
For iOS - Double-press the Home button and find Touch ‘n Go eWallet app then swipe the app up to close the app. Re-launch Touch ‘n Go eWallet app. Then go to setting -> general -> software update -> update your iOS (as required). Next, go to App Store -> Update
4) Line connectivity
Launch your internet browser, type www.google.com and tap Go. If the page fails to load, you may have internet connectivity issues.
5) Clear cache
Open Settings, tap Apps and look for Touch ‘n Go eWallet app. Scroll to the bottom. Choose STORAGE and tap the CLEAR CACHE button.