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ngFileUpload error event callback receives 4 arguments as in: https://github.com/danialfarid/ng-file-upload/blob/master/dist/ng-file-upload-all.js#L509-514 promise.error = function (fn) { promise.then(null, function (response) { fn(response.data, response.status, response.headers, config); }); return promise; }; headers is the 3rd argument, config is the 4th argument. In your code config is referencing headers. headers.file is undefined so this is how you get the error … Read more