How do I Spawn bullet on shoot with turret?

Hi,

I have 4 type turret in my defense game, and enable initial state with buy on touch the buy bottom.

when i have some turret in level, enable turret work good, but i must buy the first turret by iid until the spawn bullet work, if i buy another turret first, turret is work but spawn no.

any idea?

Any Help?

Please!!