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If this error occurs, you should make sure that your .htaccess file in your WordPress’s main directory has the following rules:
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RewriteBase /
RewriteCond %{REQUEST_FILENAME} !–f
RewriteCond %{REQUEST_FILENAME} !–d
RewriteRule . /index.php [L]
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If you do not have .htaccess file at all, you should create one containing the above rules, which will enable the use of SEF on the webserver.