i have this error
DataTables warning: table id=userTable - Ajax error. For more information about this error, please see http://datatables.net/tn/7
i tryed reinstalling the panel but it didnt worked
Did you follow the directions on the link you attached? Devs need to know what code was replied on your server to be able to help you with it.
(https://i.postimg.cc/ThsC7hVK/error-502.png) (https://postimg.cc/ThsC7hVK)