Have I read the related troubleshooter articles above before posting (which pages?)? Yes
Have I searched the tickets before posting? Yes
Have I read the documentation before posting (which pages?)? No
Joomla! version: 2.5.6
PHP version: 5.2.17
MySQL version: 5.0.96
Host: (optional, but it helps us help you)
Admin Tools version: 2.3.1
Description of my issue: Using Admin Tools to upgrade to Joomla v2.5.14. I get a pop up box that states ERROR Null. Any ideas - many thanks.