このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語):
success error callback
対処
関連リンク
success / error callback(s) not being invoked after 'fetch' (on ...stackoverflow.com/.../success-error-callbacks-not-being...
https://stackoverflow.com/questions/7924097/success-error-callbacks-not-being-invoked-after-fetch-on・・・
Parse Query.First Success / Error Callback intermittently not ...
https://stackoverflow.com/questions/36836017/parse-query-first-success-error-callback-intermittently・・・
Backbone model.save() not hitting success/error callback?
https://stackoverflow.com/questions/20869951/backbone-model-save-not-hitting-success-error-callback