need help with skript

[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?

 

[TehCheetah]

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?

Please use the CODE tags.
First off, I have noticed that you're trying to remove something from zombie count when {zombiecount} is not set. Try making it a thing! If you need more help, just reply!

Keep in mind, I am not the best skripter there is, and I too make mistakes. Maybe you have it correctly and I am just not seeing it!
Have a good day!