Solved zombie death - need help

[MightyMathan]

Hey so i made a skript when a zombies dies it should give the player who killed it money and xp and it doesnt work.
this is the skript:
on death of zombie:
clear the drops
remove 1 from {zombiecount}
broadcast "%{zombiecount}%"
add 2 to {%killer%.money}
add 1 to {%killer%.xp}
how do i fix it?

 

[Grandfish]

what is the problem you didnt state what was wrong. Was there any errors?

 

[Shadow501pl]

You cannot use "add 1 to {example}" use:

on death of zombie:
  clear the drops
  # Important
  set {xp.%player%} to {xp.%player%} + 1