Server not starting about livecam HOT 2 CLOSED

// npm install livecam
 
const LiveCam = require('livecam');
const webcam_server = new LiveCam({
    // address and port of the webcam UI
    'ui_addr': '127.0.0.1',
    'ui_port': 11000,

    // address and port of the webcam Socket.IO server
    // this server broadcasts GStreamer's video frames
    // for consumption in browser side.
    'broadcast_addr': '127.0.0.1',
    'broadcast_port': 12000,

    // address and port of GStreamer's tcp sink
    'gst_tcp_addr': '127.0.0.1',
    'gst_tcp_port': 10000,

    // callback function called when server starts
    'start': function () {
        console.log('WebCam server started!');
    },

    // webcam object holds configuration of webcam frames
    'webcam': {

        // should frames be converted to grayscale (default : false)
        'grayscale': true,

        // should width of the frame be resized (default : 0)
        // provide 0 to match webcam input
        'width': 800,

        // should height of the frame be resized (default : 0)
        // provide 0 to match webcam input
        'height': 600,

        // should a fake source be used instead of an actual webcam
        // suitable for debugging and development (default : false)
        'fake': false
    }
});
 
webcam_server.broadcast();