mostly this kind of error is caused by missing an .htaccess file in your root wordpress directory ,
Please check that
if . htaccess no available create a new on in root of wp and past that default Wordpress configuration.

# BEGIN WordPress RewriteEngine On RewriteBase / RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] # END WordPress