sun.net.www.protocol.file.FileURLConnection cannot be cast to java.net.HttpURLConnection

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function:saveVideo

const storeLocation = `${RNFS.DocumentDirectoryPath}`
let pathName = new Date().getTime() + '0714.mp4'
let downloadDest = `${storeLocation}/${pathName}`
const ret = RNFS.downloadFile({
	fromUrl: videoUrl,
	toFile: downloadDest,
ret.promise.then(res => {
	if (res && res.statusCode == 200) {
		var promise = CameraRoll.saveToCameraRoll('file://' + downloadDest)
		promise
			.then(result => {
				Toast.showShortCenter('Saved to album')
			.catch(error => {
				Toast.showShortCenter('Save failed')
	console.log(res)
}).catch((error)=>{
	console.log(error)
 { [Error: sun.net.www.protocol.file.FileURLConnection cannot be cast to java.net.HttpURLConnection]
      framesToPop: 1,
      nativeStackAndroid: [],
      userInfo: null,
      code: 'EUNSPECIFIED',
      line: 3059,
      column: 26,
      sourceURL: 'http://10.0.2.2:8081/index.delta?platform=android&dev=true&minify=false' }
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As @Drckk said, in my case it was because I was calling RNFS.downloadFile passing a file:// URI to parameter fromUrl. That's not possible. It can't download stuff from the file system.
you can on ios