Upgrade from 2.9.2 to 3.0 problems

After the upgrade, am unable to login. All that is displayed is:
/** * Allows you to change which class SimplePie uses for handling category data. * Useful when you are overloading or extending SimplePie’s default classes. * * @access public * @param string $class Name of custom class. * @link https://php.net/manual/en/keyword.extends.php PHP4 extends documentation * @link https://php.net/manual/en/language.oop5.basic.php#language.oop5.basic.extends PHP5 extends documentation */ function set_category_class($class = ‘SimplePie_Category’) { if (SimplePie_Misc::is_subclass_of($class, ‘SimplePie_Category’)) { $this->category_class = $class; return true; } return false; }
And this causes my browser to crash. I tried to disable all of the plugins by renaming the folder and using myphp, but this did not fix.
Any help would be appreciated!