Error Characteristics : The error message "A system issue occurred. Please try again." is appeared when log in with phone number.
This error is occurred because of many possibilities.
Your Better HR app is outdated. If so, please update the latest version.
You need to update the Google Play Services.
Other than these facts, if your phone is Xioami,
i. Your phone's android version may be 4.4
ii. Your Better HR app may be installed from fake google play service. Need to get with Zapya from a non-xioami android.