You can set CakePHP Debug Level

CakePHP Debug Level:

Production Mode:
0: No error messages, errors, or warnings shown. Flash messages redirect.

Development Mode:
1: Errors and warnings shown, model caches refreshed, flash messages halted.
2: As in 1, but also with full debug messages and SQL output.
3: As in 2, but also with full controller dump.

Note:-
In production mode, flash messages redirect after a time interval.
In development mode, you need to click the flash message to continue.

In core.php file u will get this code:-

Configure::write('debug',2);