THE ANSWER TO GET BACK INTO YOUR ADMIN PANEL IS:
the bottom of the functions.php is probably missing the “closing-mark” of the PHP script, which is “?>”
It enabled me to get back into the admin panel.
TO GET A POSSIBLE SLIDER BACK TO WORK:
My slider was also not working because of the security plugin Timthumb Vulnerability Scanner. I disabled the plugin and now everything is ok. Same is true for Bulletproof probably. They see a part of the javascript for the slider as a security threat and disable it.
