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.
![Image](https://www.hellochess.cn/wp-content/uploads/2018/05/p1-1.jpg)
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)