Warning message posts issue?

Ever since I updated to the newest version of WordPress 3.5.1 I’ve been seeing this message appear at the top of my website at https://www.theafhl.com and I don’t know what it means …

Warning: Invalid argument supplied for foreach() in /misc/25/000/212/149/6/user/web/theafhl.com/wp-includes/post.php on line 3601

Here is the file – https://pastebin.com/fNuZGbu3

One of the things I noticed is that new posts are suddenly no longer static on home page. It used to be every time I would publish a new post it would automatically display on my home page. Now when I publish a new post it’s not displaying at all on home page. Sometimes when I’m logged in the post will finally show up but then disappear. Also, the comments are no longer appearing at the bottom of some posts.

The login located in the left sidebar is also not working properly. I’ll login with correct username and password and nothing happens… a message isn’t even displayed. Eventually when I refresh the page a bunch of times it will finally show me as logged in and I can go to the dashboard.

How do I fix this?

Help is greatly appreciated as always.

Tony