To turn on PHP error reporting access your Hostinger panel and click on the Hosting tab.
Navigate to the advanced session and click on PHP configuration:
Then click on PHP options and mark display_errors:
Now just scroll down and click on Save to apply your changes, refresh your website page and now it will be showing the error messages!
NOTE: To turn it off, simply follow the turn off PHP errors tutorial, or do the reverse step from this same tutorial.