How to load a ModuleScript from plugin code? Using VSCode and Argon

I’m writing plugin code in a VSCode and Argon environment. I’m encountering an error when trying to load a ModuleScript from the plugin code. Could someone please explain the correct way to load it?

Here’s the specific code I’m using:

init.server.luau

local ColorModule = require(colorModule)

local toolbar = plugin:CreateToolbar("Color Changer")
local button = toolbar:CreateButton(
    "Change Color", 
    "Randomly change color of selected objects", 
    "rbxassetid://4458901886"
)

local function changeColor()
    local selection = game:GetService("Selection")
    local selectedObjects = selection:Get()
    
    for _, object in ipairs(selectedObjects) do
        ColorModule.changeObjectColor(object)
    end
end

button.Click:Connect(changeColor)

colorModule.server.luau

local ColorModule = {}

function ColorModule.getRandomColor()
    return Color3.new(math.random(), math.random(), math.random())
end

function ColorModule.changeObjectColor(object)
    if object:IsA("BasePart") then
        object.Color = ColorModule.getRandomColor()
    end
end

return ColorModule

Any help would be greatly appreciated. Thanks in advance!