dart - Exception when trying to load .mp3 file in Phaser -

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i trying load very short .mp3 file in preload() function this: 

game.load.audio('sword', '$assetpath/swordraw.mp3', true);

as code gets executed, crashes error

breaking on exception: invalid arguments(s)

pointing console.warn in phaser's loader's fileerror function below:

fileerror(int index) {    this._filelist[index]['loaded'] = true;   this._filelist[index]['error'] = true;    this.onfileerror.dispatch([this._filelist[index]['key'], this._filelist[index]]);    window.console.warn("phaser.loader error loading file: "    + this._filelist[index]['key'] + ' url ' + this._filelist[index]['url']);      this.nextfile(index, false);  }

through debugger of darteditor have seen reason _filelist[10]['url'] (url audio file) picked being null here, , cause of exception (can't concat. null string) why url null?

i've checked obvious: file name correct , assetpath initialised correctly since other files (which images) before load fine. seems audio file issue of kind can't see problem is.

oh, seems found offender here... https://github.com/playif/play_phaser/blob/ae6a08e5a6eb159149fac01e5831fd8572223a44/lib/loader/loader.dart#l1447

when loader setting stuff newly added file calls getaudiourl if file audio file... 

getaudiourl(urls) {  //string extension;  if (urls string) {   urls = [urls]; }  (var = 0; < urls.length; i++) {   var url = urls[i];   //extension = urls[i].tolowercase();   //extension = extension.substr((math.max(0, extension.lastindexof(".")) || infinity) + 1);    if (this.game.device.canplayaudio(url.split('.').last)) {     //return urls[i];     return url;   }  }  return null;

}

...and may gather above, method return null seemingly if device cannot play the type of file supplied. then, dartium can't play .mp3s?


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