I can not access the admin panel of my site

Yesterday I started having problems with one of my sites on a wordpress sites yesterday. Its just the one site. I have a wordpress multisite installation, but just one site is acting up.
I can view pages ok as a regular user not logged in. recipes.nuenotion.com
but I can not access the admin panel of that site, but I can access the admin panel of other sites.
I did not have backups configured correctly, but I do have AWS RDS, so I did a rollback to a period 24hours before the problem started happening.that did not work.so I believe its a plugin issue.

Last weekend I installed W3TC and some WPMU plugins to include hummingbird, I was careful not to turn on minify, as that was breaking my site with W3TC