Why is it that when I enable error messages using these instructions: https://www.templatemonster.com/help/magento-how-to-display-error-messages.html
That my site completely stops work? Before, my homepage worked fine. But when I change
index.php as the article suggests, I just get this error message on my home page:
Warning: fopen(/git/magento/var/locks/index_process_4.lock): failed to open stream: Permission denied in /git/magento/app/code/core/Mage/Index/Model/Process.php on line 423
Why would it start failing all of a sudden? Does enabling error messages somehow cause warnings to become errors?
Thank you for your help.
The real question here is why does enabling error messages turn the warnings into errors? That's why I don't believe this question is a duplicate at all.