Fix 404 error after changing permalink structure

If your .htaccess file were writable, wordpress do this automatically, but it isn’t so these are the mod_rewrite rules you should have in your .htaccess file.

1- Open .htaccess file and copy following data in that file.

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

2.After update file permalink issue will resolve.

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