javascript - uncaught exception error "Illegal operation on WrappedNative prototype object" -

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is there idea why following javascript/jquery code might produce error message: uncaught exception: [exception... "illegal operation on wrappednative prototype object"] ?

code:

function deletereceipt(id){  var $delconfdialog = $('<div id="dialog-confirm"></div')                        .html('are sure want delete receipt?')                        .dialog({                           autoopen: true,                           title: 'delete confirmation',                           buttons: {                              "delete": function(){                                 $.post('receipt.py',{'cm':'delete','receiptid': obj},function(){                                    $('#receiptrow'+id).remove();                                 });                                 $(this).dialog('close');                              },                              "cancel" :function(){                                 $(this).dialog('close');                                 }                           }                        });     }

you violating basic oop principles here: separate method object.


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