Modding Help Custom NPC's not activating trade

[09:15:28.854] [Error] [string "/npcs/bmain.lua"]:162: (StarException) Lua Exception caught running action node enableTrading in behavior merchant: (LuaException) Error code 2, [string "/scripts/actions/merchant.lua"]:8: bad argument #1 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function '_ENV.pairs'
[string "/scripts/actions/merchant.lua"]:8: in global 'buildTradingConfig'
[string "/scripts/actions/merchant.lua"]:153: in function <[string "/scripts/actions/merchant.lua"]:151>

This is the code i get whenever i attempt to interact with the npc

Below is the code for the merchant npc

{
"type" : "archfiendmerchant",
"baseType" : "base",
"damageTeamType" : "friendly",
"identity" : {
"facialHairType" : "",
"facialHairGroup" : "",
"personalityArmOffset" : [0, 0],
"hairType" : "fem4",
"bodyDirectives" : "?replace;c7815b=bababa;ffe2c5=ffffff;ffc181=dedede;d39c6c=cfcfcf",
"personalityArmIdle" : "idle.4",
"gender" : "female",
"color" : [51, 117, 237],
"personalityHeadOffset" : [-1, 0],
"hairGroup" : "hair",
"facialMaskDirectives" : "?replace;c7815b=bababa;ffe2c5=ffffff;ffc181=dedede;d39c6c=cfcfcf",
"species" : "archfiend",
"personalityIdle" : "idle.4",
"facialMaskGroup" : "horns",
"name" : "sale",
"facialHairDirectives" : "",
"emoteDirectives" : "?replace;c7815b=bababa;ffe2c5=ffffff;ffc181=dedede;d39c6c=cfcfcf",
"hairDirectives" : "?replace;735e3a=828282;a38d59=b8b8b8;d9c189=eaeaea",
"facialMaskType" : "3"
},
"merchant" : {
"waitTime" : 10,
"storeRadius" : 1,
"poolsFile" : "/merchantpools.config",
"categories" : {
"default" : ["randomswords"]
},
"buyFactorRange" : [ 0.9, 1.2 ],
"sellFactorRange" : [ 0.2, 0.2 ],
"numItems" : 10
},
"initialScriptDelta" : 5,
"scriptConfig" : {
"behavior" : "merchant",
"dialog" : {
"converse" : {
"default" : {
"default" : [
"Hey welcome to Nightingale! we're still recovering but we're making it!"
],
"archfiend" : [
"Welcome back home! I think we're getting a letter from Lucifer soon."
]
}
}
}
},
"items" : {
"override" : [
[0, [
{
"back" : [ { "name" : "archfiendwingsalbino" } ],
"chest" : [ { "name" : "archfiendtitan4chest" } ],
"legs" : [ { "name" : "archfiendtitan4pants" } ]
}
]
]
]
}
}