If you're trying to play on an Android device, and not being accurately located, then please make sure that WIFI, GPS, and mobile data are all turned on.
If that does not work you may need to clear your cache from your mobile in order to be accurately located. This process is different for every device, however, the most common method available to do this, is to go to Settings then BetRivers and select Clear Cache.
If that option is not available another easy way to clear the cache across all apps on your phone is to download an app from the 'Play Store' store for this such as App Cache Cleaner.