How do I get this first person viewmodel script to work?

I'm following a tutorial for a first person viewmodel. It doesnt work and repeatedly returns the following error when I run it:

Model:SetPrimaryPartCFrame() failed because no PrimaryPart has been set, or the PrimaryPart no longer exists. Please set Model.PrimaryPart before using this. - Client - Framework - Client:38

I've already set the Primary part to the model in a replicated storage folder.

Code:

local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:wait()

local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

local camera = game.Workspace.CurrentCamera

local framework = {
    inventory = {
        "FNC";
        "HiPower";
        "Knife";
        "M26";
    };

    module = nil;
    viewmodel = nil;
}

function loadSlot(Item)
    local viewmodelFolder = game.ReplicatedStorage.Viewmodels
    local moduleFolder = game.ReplicatedStorage.Modules

    if moduleFolder:FindFirstChild(Item) then
        framework.module = require(moduleFolder:FindFirstChild(Item))

        if viewmodelFolder:FindFirstChild(Item) then
            framework.viewmodel = viewmodelFolder:FindFirstChild(Item):Clone()
            framework.viewmodel.Parent = camera
        end
    end
end

RunService.RenderStepped:Connect(function()
    for i, v in pairs(camera:GetChildren())  do
        if v:IsA("Model") then
            v:SetPrimaryPartCFrame(camera.CFrame)
        end
    end
end)

loadSlot(framework.inventory[1])