Ways to solve white screen \ page for an online store {SEO-Shop}, OpenCart 2.x, 3.x, ocStore

Sometimes when working with modules you can get so-called white screen. In fact, this white screen lies the 500-I error, which suggests that somewhere there is a discrepancy.

The problem is that one description, "I have a white screen", it is difficult to tell the exact cause of the error. Reasons for this may be too much.

In this case, the desired web server logs, which contains an entry about a PHP Fatal Error, sometimes there is PHP Syntax Error.

An example of this error:

Fatal error: Class 'Illuminate\Foundation\Application' not found in /home/vagrant/Code/laravel/getwhiteboard/bootstrap/app.php on line 14

With this error, not the message "I have a white screen", you need to contact us for support.

The easiest way to know this error to fix it index.php in two places.

First, commenting the following line:

set_error_handler('error_handler')

It should be like this:

//set_error_handler('error_handler')