I am creating a form with ajax submission in my Drupal custom form module.
When I click my submit button, I get the following error:
ajax: ajax.form.ajaxSubmit is not a function.
I am searching some blogs, try something like uninstalling lightbox2 module, color box module, etc. But again the same error is displayed.
How can fix this error?
Note: I installed Lightbox first, but after this error I uninstalled it again.