Multer Throwing Weird Error While Uploading File Via Ng-file Upload

I did some research upon this and I still don't know what is going on here. The google has irrelevant search result or the given error code/message. Here is my angular controller,

Solution 1:

The answer is that multer do not accept array in ng-upload module.

answer was given by @mscdex on other thread.

Multer not accepting files in array format gives 'Unexpected File Error'

The real answer credit goes to mscdex (https://stackoverflow.com/users/2050455/mscdex)