can't access Magento back-end and front-end (Compilation Issue)
Go to your Magento’s installation root and edit the following file “includes/config.php": Comment out the line that is not commented out, and the line that is commented out, change it so that it is not. For example, if the lines read this:
define('COMPILER_INCLUDE_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'src');
#define('COMPILER_COLLECT_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'stat');
change the lines to this:
#define('COMPILER_INCLUDE_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'src');
define('COMPILER_COLLECT_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'stat');
Remember: NEVER use the ‘Enable’ Compilation button before running the compilation first (‘Run Compilation Process’ button), especially if any files where changed on your system.