If you are running Phoca Gallery 3.x and Joomla! 2.5 and you get the following error message (or blank page in case displaying of php error is not enabled):

 

Fatal error: Access level to PhocaGalleryLoader::$classes must be protected

 

just upgrade to latest version of Phoca Gallery. Now (06-02-2012) it is version 3.1.4

Download Phoca Gallery