Undefined variables, does not play

I just installed to play an MP3 stream, which plays fine with the native HTML 5 player, but does not play with this plugin. I get many notices of undefined variables:

Notice: Undefined variable: src_attribute in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 410

Notice: Undefined variable: mp4_source in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 411

Notice: Undefined variable: mp3_source in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 412

Notice: Undefined variable: webm_source in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 413

Notice: Undefined variable: flv_source in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 414

Notice: Undefined variable: wmv_source in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 415

Notice: Undefined variable: ogg_source in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 416

Notice: Undefined variable: captions_source in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 417

Notice: Undefined variable: loop_option in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 423

Notice: Undefined variable: mediahtml in \media-element-html5-video-and-audio-player\mediaelement-js-wp.php on line 429

I was able to fix the undefined variables by initializing with with null, but it still does not play.