Transfer Native - Uploading file always error 1

Ionic Native
1

Hi guys, this is my first time writing here, and the reason is that I can’t find the solution to this problem.

I want to record an audio file and then upload it to ACRCLOUD service for recognition. The audio file is correctly created, but when I try to upload it (using Transfer Native Plugin) I always get FileTransferError 1:

Here is my code:

saveUpload(){

		var path = null;
		var file_name = "new2";
		var file_extension = null;


	    if(this.plt.is('ios')){

	        file_extension = ".wav";
	        path = this.file.tempDirectory;
	    
	    }else{
	        file_extension = ".aac";
	        path = this.file.externalRootDirectory;
	    }

	    this.file.createFile(path, file_name + file_extension, true).then((fileEntry) => {

	    	var audio = this.media.create(fileEntry.toURL()	);

	    	audio.startRecord();

			window.setTimeout(() => {
			  
				audio.stopRecord();
	            
				var formData = {    					
					access_key: 'xxxxxxxxxxxxxxxxxx',
					data_type: 'audio',
					signature_version: 1,
					signature: this.signature,
					sample_bytes: 10000,
					timestamp: this.timestamp
				}

				let options: FileUploadOptions = {
					fileKey : "sample",
					fileName : fileEntry.toURL().substr(fileEntry.toURL().lastIndexOf('/') + 1),
					httpMethod : "POST",
					params : formData,
					headers : {},
					mimeType : 'audio/acc' 
				};

				var fileTransfer = this.transfer.create();

				fileTransfer.upload(fileEntry.toURL(), encodeURI('http://identify-us-west-2.acrcloud.com/v1/identify'), options)
				.then((data) => {
					console.log(data);

				}, (err) => {
					console.log(err);
				})

			}, 10000);	    	

	    });

 		
	}
}

The error is:

FileTransferError
body:"<!DOCTYPE html>↵<html>↵<head>↵<title>Error</title>↵<style>↵    body {↵        width: 35em;↵        margin: 0 auto;↵        font-family: Tahoma, Verdana, Arial, sans-serif;↵    }↵</style>↵</head>↵<body>↵<h1>An error occurred.</h1>↵<p>Sorry, the page you are looking for is currently unavailable.<br/>↵Please try again later.</p>↵<p>If you are the system administrator of this resource then you should check↵the <a href="http://nginx.org/r/error_log">error log</a> for details.</p>↵<p><em>Faithfully yours, nginx.</em></p>↵</body>↵</html>"
code:1
exception:"http://identify-us-west-2.acrcloud.com/v1/identify"
http_status:500
source:"file:///storage/emulated/0/new2.aac"
target:"http://identify-us-west-2.acrcloud.com/v1/identify"

Transfer error 1 refer to File not Found error, and the response of server is the same that I get when I try to send values without file.

The problem here is when I call Transfer it does´t load the record file