I am working with WordPress 3.5.8. Yesterday I made some changes into it to a friend. I don\'t know what happened, but after some time when I try to log in at wp-admin side and
All your problem is solved right now just follow this instruction:
for example this is your theme folder name: "mytheme" just put "x" in the first letter like this "xmytheme" tho di activate.
Then after that go back to your wp-admin panel then BOOM! wp-admin accessable.
When you access your wp-admin panel or you are on your dashboard, again activate your theme again, but before that. REMOVE THE "X" letter you putted in your theme name. example: "xmytheme" just remove "x", output like this: "mytheme"
hope this help!.