Common WordPress Errors and How to Fix Them
A field guide to common WordPress errors: what each one means, how to tell them apart, and a link to the exact fix for each.
Category
WordPress Errors
Diagnose common WordPress failures without jumping straight to risky changes.
Fix 404 Errors on Custom Post Types After Changing Permalinks
WooCommerce products, portfolio items, or other custom post types 404ing after a permalink change? Here's how to fix it without breaking other pages.
Fix WordPress 404 Errors After Changing Permalinks (Apache & Nginx, With Safe Rollback)
Every page 404s after changing your WordPress permalink structure? Here's the Apache fix, the Nginx fix, and how to tell which server you're on.
Fix a WordPress Admin Login Loop Caused by Cloudflare
WordPress admin login keeps redirecting back to wp-login.php? Here's how to tell if Cloudflare Turnstile, Bot Fight Mode, or your SSL mode is the cause.
Fix a WordPress Critical Error After Upgrading to PHP 8.1
White screen or 'There has been a critical error' right after upgrading to PHP 8.1? Revert PHP first, then find the exact plugin causing it with WP_DEBUG_LOG.
WordPress Stuck in Maintenance Mode After a Failed Update? Here's the Safe Fix
Site stuck showing 'Briefly unavailable for scheduled maintenance' after an update? Here's how to safely delete the .maintenance file and confirm nothing broke.
About WordPress Errors guides
These guides cover the errors that take a site down or lock you out: the "critical error" screen after a PHP upgrade, a site stuck in maintenance mode after a failed update, 404s on pages and custom post types after a permalink change, and admin login loops caused by Cloudflare.
Each one starts from the symptom you actually see, explains which layer is failing (WordPress itself, a plugin, the server's rewrite rules or the CDN in front of it), and orders the fixes from the least to the most invasive, with a backup step before anything that changes files or the database.
Not sure where to begin? Start with the overview of common WordPress errors, then open the guide that matches the exact message on your screen.