Cause of Error: Unable to get property 'fnSetData' of undefined or null reference at line 820

Hi guys I am getting the below error Unhandled exception at line 820, column 4 in https://localhost:44306/Scripts/jquery.dataTables.js

0x800a138f - JavaScript runtime error: Unable to get property 'fnSetData' of undefined or null reference for the function function _fnSetCellData( oSettings, iRow, iCol, val ) { var oCol = oSettings.aoColumns[iCol]; var oData = oSettings.aoData[iRow]._aData;

        oCol.fnSetData( oData, val );
    }

I am setting the datatable like this $('#tblContractLines').dataTable({ "aaSorting": [] }); This dataTable was working on December 23 when I demo'ed it. The only difference is that now it has data whereas before there was none.