The cPanel Error Log is a powerful tool that can help you identify the possible cause of all those pesky HTTP errors thet you might get when developing your site.
In order to check the error log you will need to follow the steps shown below:
Step 1: Log into the desired cPanel account.
Step 2: Navigate to the Logs section there and click on the Error Log icon.
Step 3: Once you click on the icon you will be redirected to a new page containing the errors for the sites on this cPanel account.
Keep ind mind that the error messages are shown in reverse order, meaning that the newest entries will be at the bottom of the list.