Error 

Uncaught TypeError: Cannot read property 'call' of undefined

backend.min.js:4

The Gem Shortcode "TheGem Product Grid, TheGem Product Slider"

visual composer save button not working

Message Error:

Uncaught TypeError: Cannot read property 'call' of undefined
    at n.<anonymous> (backend.min.js?ver=5.4.5:4)
    at load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:60
    at Function.m.each.m.forEach (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:60)
    at n.initDependency (backend.min.js?ver=5.4.5:4)
    at n.init (backend.min.js?ver=5.4.5:4)
    at n.buildParamsContent (backend.min.js?ver=5.4.5:4)
    at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:2)
    at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:2)
    at y (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:4)
    at XMLHttpRequest.c (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:4)
(anonymous) @ backend.min.js?ver=5.4.5:4
(anonymous) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:60
m.each.m.forEach @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:60
initDependency @ backend.min.js?ver=5.4.5:4
init @ backend.min.js?ver=5.4.5:4
buildParamsContent @ backend.min.js?ver=5.4.5:4
i @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:2
fireWith @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:2
y @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:4
c @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:4
XMLHttpRequest.send (async)
send @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:4
ajax @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:4
render @ backend.min.js?ver=5.4.5:4
showEditForm @ backend.min.js?ver=5.4.5:3
createElement @ backend.min.js?ver=5.4.5:3
dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:3
r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils,jquery-ui-sortable,wp-a11y,underscore,shortcode&load[]=,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload&ver=4.9.1:3