Android SocketIOClient error: "Scheme 'ws' not registered

I have a node.js/socket.io server and I wanted to create an Android app to comunicate via websockets. I found a library: https://github.com/koush/android-websockets But when I try to use the sample code (Socket.IO Usage):

SocketIOClient client = new SocketIOClient(URI.create("ws://myIP:port"), new SocketIOClient.Handler() {
    String TAG = "WebSocket Handler";
    @Override
    public void onConnect() {
            Log.d(TAG, "Connected!");
    }

    @Override
    public void on(String event, JSONArray arguments) {
        Log.d(TAG, String.format("Got event %s: %s", event, arguments.toString()));
    }

    @Override
    public void onDisconnect(int code, String reason) {
        Log.d(TAG, String.format("Disconnected! Code: %d Reason: %s", code, reason));
    }

    @Override
    public void onError(Exception error) {
        Log.e(TAG, "Error!", error);
    }
});

client.connect();

(using IP and port, or url:port) the following error occurs:

Error!
05-19 18:03:56.065: E/WebSocket Handler(629): java.lang.IllegalStateException: Scheme 'ws' not registered.
05-19 18:03:56.065: E/WebSocket Handler(629):   at org.apache.http.conn.scheme.SchemeRegistry.getScheme(SchemeRegistry.java:80)
05-19 18:03:56.065: E/WebSocket Handler(629):   at org.apache.http.impl.conn.DefaultHttpRoutePlanner.determineRoute(DefaultHttpRoutePlanner.java:107)
05-19 18:03:56.065: E/WebSocket Handler(629):   at org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:565)
05-19 18:03:56.065: E/WebSocket Handler(629):   at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:292)
05-19 18:03:56.065: E/WebSocket Handler(629):   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-19 18:03:56.065: E/WebSocket Handler(629):   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-19 18:03:56.065: E/WebSocket Handler(629):   at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-19 18:03:56.065: E/WebSocket Handler(629):   at android.net.http.AndroidHttpClient.execute(AndroidHttpClient.java:243)
05-19 18:03:56.065: E/WebSocket Handler(629):   at com.codebutler.android_websockets.SocketIOClient.downloadUriAsString(SocketIOClient.java:48)
05-19 18:03:56.065: E/WebSocket Handler(629):   at com.codebutler.android_websockets.SocketIOClient.access$1(SocketIOClient.java:45)
05-19 18:03:56.065: E/WebSocket Handler(629):   at com.codebutler.android_websockets.SocketIOClient$3.run(SocketIOClient.java:200)

I can't find a solution