Debuging Error Problem

[eluser]tonanbarbarian[/eluser]
In the config/config.php file set

Code:

$config['log_threshold'] = 2;
$config['log_path'] = '/path/to/log/folder/';

This will log anything that CI is doing into a dated file in the specified folder.
You might also want to look here
Error Handling
Profiling Your Application

But if you are getting 500 errors you might not get anything logged as this is your server having problems not the code most likely