Courses display Isuue

I am facing issue in courses page. When there is no course at all then there is no issue. Page displays says no course available. But as soon as I add a course then Fatal Error occur. I am non-technical person please suggest me what to do.

Error:
Fatal error: Uncaught Error: Call to undefined function learn_press_get_course_rate_total() in /home/padhanep/domains/padhanepal.com/public_html/wp-content/themes/education-lms/inc/template-tags.php:216 Stack trace: #0 /home/padhanep/domains/padhanepal.com/public_html/wp-content/themes/education-lms/learnpress/content-course.php(19): education_lms_course_rate_total() #1 /home/padhanep/domains/padhanepal.com/public_html/wp-includes/template.php(724): require(‘/home/padhanep/…’) #2 /home/padhanep/domains/padhanepal.com/public_html/wp-content/plugins/learnpress/inc/lp-template-functions.php(2481): load_template(‘/home/padhanep/…’, false) #3 /home/padhanep/domains/padhanepal.com/public_html/wp-content/plugins/learnpress/templates/content-archive-course.php(55): learn_press_get_template_part(‘content’, ‘course’) #4 /home/padhanep/domains/padhanepal.com/public_html/wp-content/plugins/learnpress/inc/lp-template-functions.php(2518): include(‘/home/padhanep/…’) #5 /home/padhanep/domains/padhanepal.com/public_html/wp-content/ in /home/padhanep/domains/padhanepal.com/public_html/wp-content/themes/education-lms/inc/template-tags.php on line 216

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