[FSOD] [AS3 ERROR]

Everytime I try to build/rebuild this is gives 5 errors and 236 warnings I used the turotial that was made for this as3.
https://github.com/kaos00723/RotMG_Client_27.7.X2
For some reason I cannot make it work.

try flex 4.9.1

If not, check your options, and make sure you have your settings like this:
http://prntscr.com/jg3xd2