i can not load the fen board button even in a default wordpress theme. i think this button is used to easily make the chess position.
when press the fen board button,it display loading ,and then nothing happened.
and in the chrome console,it displays some errors.
VM1310:5803 Uncaught TypeError: Cannot read property 'getEl' of undefined
at Object.addChild (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:5803:28)
at Object.wrapper.extend.$owner (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:1123:23)
at Object.parent (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:1099:18)
at Object.addChild (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:10726:21)
at Object.wrapper.extend.$owner (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:1123:23)
at Object.addChild (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:9158:34)
at Object.wrapper.extend.$owner (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:1123:23)
at Object.addChildren (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:9142:27)
at Object.wrapper.extend.$owner (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:1123:23)
at Object.remainingLifeCycle (eval at <anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=4.9.5:2), <anonymous>:8541:18)