Flash Builder Flash Professional ActionScript Code

Hello All, I am new to ActionScript. I watched a Tom Kircha tutorial video on multicasting. I was impressed with this and i thought i should attempt it myself. I copied virtually all the same code in Flash Builder but for some reason the application was unable to run. I have captured some screenshots below for you. Have a look and please tell me if you noticed any errors so i can resolve this. Thanks

I know the images are difficult to see i apologize for that…Please zoom in.