codeigniter and wp subdomain issue

[eluser]Unknown[/eluser]
Hi all, I have this issue since my boss want to add wp at our CI project, he wants to control everything at wp then the user login to CI etc.. So we decided to put the wp at subdomain like this one htt://blog.oururl.com , so my problem is this, when we created new article at wp, CI will always redirect to 404..

RewriteEngine on
RewriteBase /
RewriteCond $1 !^(index\.php|assets|images|blog|wp-admin|robots\.txt)
RewriteRule ^(.*)$ index.php/$1 [L]

Please Help...