htaccess hatası olabilir. İçeriğini buraya eklr misiniz?
bu şekilde hocam
RewriteEngine OnRewriteBase /RewriteRule ^index.php$ - [L]# add a trailing slash to /wp-adminRewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]RewriteCond %{REQUEST_FILENAME} -f [OR]RewriteCond %{REQUEST_FILENAME} -dRewriteRule ^ - [L]RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]RewriteRule ^([_0-9a-zA-Z-]+/)?(.*.php)$ $2 [L]RewriteRule . index.php [L]