I've got a Facebook friend who has this problem. I'm posting for her since she can't get access to her page:
"People who know their WordPress stuff I need you! Basically I tried installing a new theme on my site and it came up with this fatal error. From there it wouldn't let me do ANYTHING. I couldn't click on a single thing without it going to this message, including trying to undo this and revert back to the old theme or even go to the dashboard or something as simple as that. Then it started saying I didn't have access to the account and was claiming my password was wrong. It took me hours just to reset my password and after I did, the login worked once but the fatal error came up again as soon as I was signed in and then when I tried logging in again, I no longer have access again even though I JUST reset the password. So basically I've lost access to my own account and even if I did have it I am unable to do anything. There doesn't seem to be any tech support for wordpress and I need access to my own damn site back!"
The blog I need help with is dvdnewsflash.wordpress.com.