calender not working

Hi, I have added this plugin but its not working. Below is the error I’m getting in console

TypeError: jQuery(…).fullCalendar is not a function
jQuery(‘#calendar’).fullCalendar({

/imperi…act us/ (line 233, col 1)
TypeError: window.parent.setDateLabel is not a function
window.parent.setDateLabel(‘date1’);

My jquery is loaded in head section. I could not find any js related to calendar.

https://ww.wp.xz.cn/plugins/appointment-calendar/