Please change the value of 'Security.salt' in app/config/core.php to a salt value specific to your application [CORE\cake\libs\debugger.php, line 684]

First find cakephp app folder ...

Then go config folder and open core.php file

You will see this lines somewhere..
/** * A random string used in security hashing methods. */

Configure::write('Security.salt', 'xxxxxxxxxxxxxxxxxxxxxxx');

if cakePHP version is 1.3 or greater then this will also be there..
/** * A random numeric string (digits only) used to encrypt/decrypt strings. */

Configure::write('Security.cipherSeed', 'xxxxxxxxxxxxxxxxxxxxxxx');

Just change the values in
Configure::write('Security.cipherSeed', 'xxxxxxxxxxxxxxxxxxxxxxx');
to
Configure::write('Security.cipherSeed', 'xxxxxxxxxxxxxxTxxxxxxxx');

--- Cheers !!!