Error " Object doesn't support property or method 'slice' " - drm conax videojs eme

hi everybody, I am trying to test DRM conax with videojs eme but it raises error. Could somebody take time to help?

<!DOCTYPE html>
<head>
  <link href="video-js.css" rel="stylesheet" />
</head>
<body>
<video id=example-video width=600 height=300 class="video-js vjs-default-skin" controls></video>
<script src="video.js"></script>
<script src="dash.all.js"></script>
<script src="videojs-dash.js"></script>
<script src="videojs-dash.min.js"></script>
<script src="videojs-contrib-eme.js"></script>
<script src="videojs-contrib-eme.min.js"></script>
<script>
var player = videojs('example-video');
player.ready(function() {
    player.src({
    src: 'http://203.162.70.105/__cl/default/__c/ch2/__op/playready/__f/index.mpd',
    type: 'application/dash+xml',
    keySystemOptions: [{
        name:"com.microsoft.playready",
        options: {
            "serverURL": "http://194.248.68.212/cxplayready/rightsmanager.asmx"
            }
        }]
    }); 
    player.play();  
});
</script> 
</body>

videojs / videojs-contrib-eme

Error " Object doesn't support property or method 'slice' " - drm conax videojs eme #39