Error 500 on localhost

You need to supply us with your code.
- What's the data you are passing to the view.
- How do you pass it to the view.
- How are you accessing it in the view.

application/config/config.php
$config['log_threshold'] = 1; // Change it into 4

And check your logs at:
application/logs/log-YYYY-MM-DD.php