Jquery Error - Internal Server Error500 -

         error: function (e, textStatus, errorThrown) {

            //alert(e.responseJSON.Message);

            alert("Some Error occured");

            $('#model').hide();

        }

    });

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Internal server error 500

Solution:- Due to Some duplicate function in Javascript

or

IF error showing Parameter BranchId

In Javascript BranchIds and BranchIds must be case sensitive as in Function name of cs file (web method)

Solution :- Due to Command.Parameters.Add("@BranchIDList") name to ("BranchIds")

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If error