Sometimes you may get error like ‘Facebook App Session Expired’ when you are in your Facebook page and it also says that you need to login again. Sessions are usually used to keep you logged in your preferred sites and services. Sessions were developed to time out so that someone else cannot get the access to your sensitive data. Facebook also uses sessions in the same way but normally reserves the sessions for third-party services and apps in order to keep your Facebook account safe. It also saves the battery life of your mobile phone.
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Facebook uses sessions to validate that your account is within its service, it could be when you play some games or using Facebook app. The sessions rely on the cached information on your smartphone or PC and when the cache is cleared, the session ends. There are several reasons for which the cache can be cleared such as by closing some apps, if any app is open for long time and by logging out of Facebook.
Here are some steps if you face Facebook App Session Expired error:
First go to settings in your phone, then scroll down to Facebook and click on it. You will be asked to sign in again. Do this and see if the problem is solved.
Most of the people face Facebook App Session Expired error when they use third-party services like Candy Crush. So the best solution is to login back to your account.
But if this step does not solve the issue then see if any updated version of the app is available on the internet. Then uninstall this one and reinstall the updated version on your phone.