Skript inventory check not working

[GreenDeviousity]

function buyItem(p: player,n: number = 1):
if {_p}'s inventory contains {item::{_n}:rice} of sunflower named "&e&lTrade Token":
remove {item::{_n}:rice} of sunflower named "&e&lTrade Token" from {_p}
give {_p} {item{_n}}

command /openbuy <number>:
trigger:
set {i} to arg-1
buyItem(player, {i})

//This just doesnt work as expected, It was supposed to check if player has enough sunflowers and then remove the amount specified in the variable that the function will run for. I get the errror sunflower named "&e&lTrade Token" is not a world

 

[Luke_Sky_Walker]

function buyItem(p: player,n: number = 1):
if {_p}'s inventory contains {item::{_n}:rice} of sunflower named "&e&lTrade Token":
remove {item::{_n}:rice} of sunflower named "&e&lTrade Token" from {_p}
give {_p} {item{_n}}

command /openbuy <number>:
trigger:
set {i} to arg-1
buyItem(player, {i})

//This just doesnt work as expected, It was supposed to check if player has enough sunflowers and then remove the amount specified in the variable that the function will run for. I get the errror sunflower named "&e&lTrade Token" is not a world

One of the biggest issues I see is the invalid usage of variables. You do not need the majority of the "{item::{_n}:rice}" variable. Below I've rewritten your code, check the notes I made for reasons why I changed it.

Spoiler: Click to reveal your code I rewrote

function buyItem(p: player, n: number = 1, i: item):
    if {_p}'s inventory contains {_n} of sunflower named "&e&lTrade Token": # You just need to check for X (or {_n}) amount of the target item
        remove {_n} of sunflower named "&e&lTrade Token" from {_p} # Same as the previous line
        give {_p} 1 of {_i}  # Not sure what your original code intended, so I added this

command /openbuy <number>:
    trigger:
        set {i2} to diamond named "&bTest Item" # Sets a item you get for X sunflowers
        buyItem(player, arg-1, {i2}) # You can just put 'arg-1' instead of using a variable since arg-1 will always be a number