Access of undefined property theVideo!

import flash.net.NetConnection;
import flash.net.NetStream;
import flash.media.Video;
import flash.events.NetStatusEvent;

var connection:NetConnection;
var video:Video;
video = new Video();
video.width = 480;
video.height = 320;

connection = new NetConnection();
connection.addEventListener(NetStatusEvent.NET_STATUS, netConnectionEvent);
connection.connect(null);

function netConnectionEvent(event:NetStatusEvent):void {
    event.target.removeEventListener(NetStatusEvent.NET_STATUS,netConnectionEvent);
    if (event.info.code == "NetConnection.Connect.Success") {
        var stream:NetStream = new NetStream(connection);
        stream.addEventListener(NetStatusEvent.NET_STATUS, netStreamEvent);
        var client:Object = new Object();
        client.onMetaData = onMetaData;
        stream.client = client;
        // attach the stream to the video to display
        video.attachNetStream(stream);
        stream.play("ColoristCuremq.flv");
        addChild(video);
    }
}

function onMetaData(info:Object):void {
}
function netStreamEvent(event:NetStatusEvent):void{
   
}

Copy and paste the code and give your video name

As far as the code shows, there is nothing that declares theVideo anywhere, so it is an unknown unless it is some object on the stage (which I doubt).  Chances are it would have involved something in the way of...

var theVideo:Video = new Video();

But aside from that, as far as I can tell, attachVideo is an AS2 method, not an AS3 method, so you probably need to either swicth the version of AS your file is trying to publish with, or stick with AS3 publishing and look thru the help documentation or Google for examples on implementing the NetConnection class with AS3.