Uncaught TypeError: Illegal invocation

Uncaught TypeError: Illegal invocation

Hi,

I am getting the above error and can't figure our why? kindly help..

This is my code:

  1. var formData = new FormData();

  3. formData.append("login_name", "731004167");
  4. formData.append("login_password", "Jassim@2013");

  6. $.ajax({
  7.     type: "POST",
  8.     url: 'signin2.php',
  9.     dataType: 'json',
  10.     data: formData,
  11. }).done(function (data)
  12. {
  13.     console.log(data);

  15.     // DevExpress.ui.dialog.alert('BlueFile', 'Success!');

  17.     if (data)
  18.     {
  19.         BlueFile_Mobile.app.navigate("my");
  20.     }
  21.     else
  22.     {
  23.         viewModel.loadPanelVisible(false);

  25.         DevExpress.ui.dialog.alert('BlueFile', 'Invalid Login name or Password!');
  26.     }
  27. }).fail(function (jqXHR, message)
  28. {
  29.     viewModel.loadPanelVisible(false);

  31.     DevExpress.ui.dialog.alert('BlueFile', 'Failed!');

  33.     DevExpress.ui.dialog.alert('Error', message);
  34. })


Thanks,
Jassim