I don't have experience with that game but I don't think this is a map problem...
Anyway, if the console prints that you must create a buy zone you must do it. In 1.6 mapping the texture used for this is called "
aaatrigger". Create a box in a simple map before putting that in your map and than do "func_buyzone", you can make it to be used only by CT's, only by T or both of them, just make sure you put all spawn points inside of it.
PS: I guess it's with orange color in your texture pack