Such issue is usually caused by unstable network connection. Make sure that your network connection is stable. If the error continues try the steps below.

Restart your device

Turning the device off and back on is a common first step when you're having issues. Press and hold the Power button, then follow any prompts that appear to confirm the restart. 

Clear the app data and cache

Android apps use a memory cache function similar to a Web browser cache. Just as clearing your cache for a website is useful for resolving loading issues, we recommend clearing your app cache.

Open the Settings menu on your device, and select Application Manager. Tap HighRoller Vegas / Facebook app in the list of applications. Tap the Clear data and Clear cache buttons. 

Force-quit the app

When you tap your device's Home button, the app you were using doesn't close; it just minimizes while continuing to run in the background. Force-quitting will close the app fully and let it start from scratch the next time you launch it.

Open the Settings menu on your device, and select Application Manager. Tap Highroller Vegas /Facebook app in the list of applications. Tap the Force quit or Force stop button.

Uninstall and reinstall the app

Open the Settings menu on your device, and select Application Manager. Tap HighRoller Vegas / Facebook app in the list of applications. Tap the Uninstall button.

After the uninstall process has completed, launch the Google Play Store app, download HighRoller Vegas, and relaunch the app.