I m getting the below error while executting the ajax call with FormData

TypeError: ‘append’ called on an object that does not implement interface FormData.

Present code Looks like as below

var formObj = $('#addTeacherForm');
        var formData = new FormData(formObj[0]);
		$.ajax({
            url: 'chkExistTeacherData',
			async: true,
            type: "POST", 
            data: formData,
            dataType: "html",

var formObj = $('#addTeacherForm');

var formData = new FormData(formObj[0]);

$.ajax({

url: 'chkExistTeacherData',

async: true,

type: "POST",

data: formData,

dataType: "html",

Solution:Please add the below lines of code in the ajax request
processData: false