Cashwalk is Available Only in Service Country.

I've been using Cashwalk for a couple years, and today I was given this error dialog saying

 "Cashwalk is Available only in the service country. Contact support for help. "

Anyone know what this is? I can't get around this, and the app closes when you click ok and I emailed support as the other option. I've tried a couple things. I reinstalled the app and rebooted my phone, but nothing worked. 

Any information or ideas???