coursepress pro next button not working

Version 1.2.2.5
coursepress pro next button not working

only coursepress and marketpress active, and while add new course not able to forward with Next button to save the press.

found there is error:
ReferenceError: tinyMCE is not defined @ http://local.lcl/wp40/wp-content/plugins/coursepress/js/coursepress-courses.js?ver=4.0:838

code ref: in file "coursepress/js/coursepress-courses.js"
var content = '';
if (tinyMCE.get('course_excerpt')) {
content = tinyMCE.get('course_excerpt').getContent();
} else {
content = $('[name=course_excerpt]').val();
}

I tested with remove browser cache:
please get into this to resolve.