AS3 Errors

I've been recently trying to set up an AS3 client for my server. I've been following a guide, but for some reason there's an error whenever I go to rebuild.

https: //gyazo. com/f13a6f868d4570f357d265ec15ce97b2



This is the guide i've been following. ^

this means you're using the incorrect flex sdk - make sure you're using flex sdk 4.9.1 instead of the most common 4.6 - if you dont know where to get it then go to where u downloaded it from, look into issues and closed, then click on the one that says 'right click'. scroll down and you'll find a hyperlink. the rest is self explanatory.

sometimes you can't use 4.9.1 for some sources. you can get errors when you try to rebuild it with the wrong sdk version.