STEP 1: Enable Debug Mode (MOST IMPORTANT)

You need to see the real error behind the message.

👉 Do this:

1. Go to your website files (via cPanel File Manager or FTP)
2. Open:
   public_html/wp-config.php
3. Find this line:

define('WP_DEBUG', false);

4. Replace with:

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', true);

5. Save the file

👉 Now reload your website — you should see the actual error message

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✅ STEP 2: Disable All Plugins (Most Common Cause)

👉 Method 1 (File Manager)

1. Go to:
   wp-content/
2. Rename folder:
   plugins → plugins_old

👉 Reload your site

• If the site works → a plugin is the problem
• Rename back to plugins, then disable one-by-one in wp-admin

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✅ STEP 3: Switch to Default Theme

Sometimes your theme is broken.

👉 Do this:

1. Go to:
   wp-content/themes/
2. Rename your active theme folder
   (e.g. mytheme → mytheme_old)

👉 WordPress will automatically switch to a default theme like:

• twentytwentyfour

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✅ STEP 4: Check .htaccess File

👉 Do this:

1. Go to public_html/
2. Find .htaccess
3. Rename it:
   .htaccess → .htaccess_old
4. Then create a new .htaccess file and paste:

# BEGIN WordPress
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPress

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✅ STEP 5: Increase PHP Memory Limit

Low memory can crash your site.

👉 Add this to wp-config.php:

define('WP_MEMORY_LIMIT', '256M');

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✅ STEP 6: Reinstall WordPress Core Files

Corrupted files = critical error

👉 Do this:

1. Download fresh WordPress from:
   wordpress.org
2. Upload:
   • /wp-admin
   • /wp-includes

⚠️ Do NOT overwrite wp-content or wp-config.php

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✅ STEP 7: Check Error Log (Very Powerful)

1. Go to:
   public_html/wp-content/debug.log

OR

2. In cPanel:
   → Metrics → Errors

👉 Look for:

• Fatal error
• Missing class
• Plugin conflict

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✅ STEP 8: Check PHP Version

• Use PHP 8.1 or 8.2
• Old themes/plugins break on newer PHP

👉 In cPanel:

• Select PHP Version

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🚨 BONUS: Based on Your Previous Error

You had this earlier:

Class "WP_Widget_Pages" not found

👉 This strongly suggests:

• Corrupted WordPress core files
• Or incomplete update

So Step 6 (Reinstall Core Files) is VERY important for you.

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✅ QUICK DIAGNOSIS FLOW

Try in this order:

1. Enable debug ✅
2. Disable plugins ✅
3. Switch theme ✅
4. Reinstall WordPress core ✅

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🎯 If You Still Have Issues

Send me:

• The new error message after enabling debug
• Or screenshot

I’ll pinpoint the exact problem and fix it with you 🔥