Ajax error when I try to upload

(anonymous) @ jquery.min.js?v=3.2.1:4 XMLHttpRequest.send (async) (anonymous) @ VM2364:1 send @ jquery.min.js?v=3.2.1:4 ajax @ jquery.min.js?v=3.2.1:4 e.fn.ajaxSubmit @ jquery.form.min.js?v=3.51:11. Drupal.Ajax.eventResponse @ ajax.js?v=8.4.4:316 (anonymous) @ ajax.js?v=8.4.4:255

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