Fix Facebook Error 2 An Unknown Error Occurred (2025)

Updated: 11/29/2025

You open Facebook to check your feed or send a message, tap a button, and suddenly see Error 2 or An unknown error occurred instead of the page you expected. Sometimes the app works on WiFi but fails on mobile data, or the web version works while the app refuses to cooperate. This generic code is Facebook’s way of saying something went wrong with your request, but with a bit of methodical troubleshooting, you can usually stop it from coming back.

Table of Contents

Method 1: Clear Facebook App Cache And Data Safely

Start the Facebook app, enter your email or phone plus password, and allow a moment for your feed to reload. Check whether actions that previously triggered Error 2, such as posting or opening notifications, now work normally.

Method 2: Fix Browser, Cookies, And Login Sessions On Web

Open a new incognito or private window, with extensions disabled, and log in to Facebook again. If Error 2 goes away, re enable extensions slowly to identify any ad blocker or privacy tool that might be interrupting Facebook’s scripts.

Warning: Do not permanently disable critical security extensions, instead add Facebook to their allow list if you discover a specific conflict.

Method 3: Check Network Stability And IP Reputation

At home, power cycle your router by unplugging it for about 20 seconds and plugging it back in, then wait for all lights to stabilize before reconnecting. When traveling, avoid staying on coffee shop or hotel WiFi login pages for long sessions, as their captive portals can drop connections in ways that surface as unknown errors in the app.