First, make sure you have the most up-to-date version of the Facebook for Android app.

To update your app:

1. Go to the Play Store or download the newest version directly from Facebook.
2. If there's a newer version of the Facebook app you don't have yet, it'll be listed there for you to download.

If you're having trouble downloading the app, check your internet connectivity. For best results, connect to Wi-Fi before downloading.

If this doesn't solve your issue, let us know.