This error is caused by having an older version of RE Mobile App installed (before fall of 2016) on the device. To resolve this error:
  1. Make note of the existing system key in the app by writing it down or taking a screenshot on the device.
  2. Uninstall the app on the device.
  3. Download the and reinstall the app.
  4. Log back into the app using the system key noted in step 1 and the user's customary Raiser's Edge login.
For additional information about setting up the app, please refer to How to install and configure the RE Mobile App.

Note: The rebuilt RE Mobile app has a patterned blue loading screen, rather than the classic Raiser's Edge orange screen of the previous RE Mobile app.