Fixing a Compiler Error in Magento

Fortunately the compiler is quite easy to manually disable. This will resolve the compiler issue and allow you to access your Magento Admin so that you can re-compile before enabling the compiler again.

Access your Magento website using FTP and open the file /includes/config.php. You should see the following code:
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define('COMPILER_INCLUDE_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'src');
define('COMPILER_COLLECT_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'stat');

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This code tells Magento where to look for the compiled files. To disable the compiler, simply comment out these lines (add a '#' character to the start of each line). The result should look like the following:

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#define('COMPILER_INCLUDE_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'src');
#define('COMPILER_COLLECT_PATH', dirname(__FILE__).DIRECTORY_SEPARATOR.'stat');