Hello

Apologies for the inconvenience.

Could you kindly check if the code below is missing in site.php? templates/shaper_varsita/sppagebuilder/addons/course_categories/site.php

If yes, can you try adding this below and check if this solves the issue or not.

$output  = '';
        $course_model = JPATH_BASE . '/components/com_splms/models/courses.php';
        $lesson_model = JPATH_BASE . '/components/com_splms/models/lessons.php';
        $helper = JPATH_BASE . '/components/com_splms/helpers/helper.php';

        if(!file_exists($course_model) || !file_exists($lesson_model) || !file_exists($helper)) {
            return;
        } else {
            require_once $course_model;
            require_once $lesson_model;
            require_once $helper;
        }

For reference, you can check this link: https://archive.joomshaper.com/forums/0-class-splmshelper-not-found-error