Moving the files

I used to have it on https://www.deaf411online.com/deaf411/wordpress, i got suggestion from someone to make my url shorter as https://www.deaf411online.com/blog. I created a new folder “blog” and the blog site look good, but i face a problem is I couldn’t access my wp-admin, it comes up with this error message:
Fatal error: main() [function.require]: Failed opening required ‘admin.php’ (include_path=’.:/usr/lib/php’) in /homepages/37/d209178942/htdocs/deaf411/wordpress/wp-admin/index.php on line 2

I try to search to redirect to /blog. I copy and moved the files (all of them) to that folder. can anyone help me out here.

Thanks!