Way to capture errors

[eluser]Unknown[/eluser]
Hi,

I am new to CodeIgniter.
I have been setting log_threshold to 4 but still not able to get any log file under application/logs/.

Code:

$config['log_threshold'] = 4;
$config['log_path'] = '';

Any clue that i can get to read the error message such as syntax error for me to debug easily?

Thanks.