Subdomain error

Hello..I’ve been using my wordpress for quite awhile now. I use philhosting as my host. My url use to be

http://www.arian3naira.net/blog ..for wordpress.

Just 3days ago I decided to merge my tumblr with my domain http://www.arian3anira.net/ Now my domain is a tumblr blog. My problem now is that I can’t access my /blog so I made a subdomain for it but still it doesn’t seem to work. This is how it looks like now:

http://www.blog.arian3naira.net, without the www will be an error. Please check. I was wondering what is the problem? What should I do to make it work.

-Ayn