How to fix Fatal error: Class not found in error in PHP?

Question

PHP

It was necessary to connect the file to the site.
Connected, now at the entrance it displays the following error:
Fatal error: Class 'PM_LIST' not found in D:\site\modules\pm_list.php on line 235
Here is the line itself 235

$Pm_List = new PM_LIST;
$Pm_List->Start_PL($cfg);

I just don't understand PHP. Please tell me what is the problem? Or maybe the line is spelled wrong?
Thanks in advance!

Answer 1

Connect class PM_LIST

Answer 2

either set up a class autoloader, for example, using Composer, or connect the file in which the class is located