This question already has an answer here:
After Civi 4.6.10 upgrade I can no longer access the Administer/Administration Console without getting an error. Here is a sample:
@import url(/devjom3update/administrator/components/com_civicrm/civicrm/css/civicrm.css); @import url(/devjom3update/administrator/components/com_civicrm/civicrm/bower_components/jquery-ui/themes/smoothness/jquery-ui.min.css); Sorry but we are not able to provide this at the moment. You do not have permission to access this page.