I get an error everytime I try to get an Instance via RemoteEvent?

Hey there!

So I'm trying to send an Instance over via an Remote Event, but all that the parameter outputs is nil. Is there any way I can fix this?

Local Script:

local player = game:GetService("Players").LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()

script.Parent.MouseButton1Click:Connect(function()
    local playerModel = workspace:WaitForChild("ViewModel"..player.Name):WaitForChild("Player")
    local playerModelHumanoid = playerModel:WaitForChild("Humanoid")

    print(playerModelHumanoid)

    game.ReplicatedStorage:WaitForChild("PlayAnimations"):FireServer("LightSlashTwoHandBlade", playerModelHumanoid)
end)

Server Script:

game.ReplicatedStorage:WaitForChild("PlayAnimations").OnServerEvent:Connect(function(player, animation, model)  
    local animation = model:LoadAnimation(script:WaitForChild(animation))

    animation:Play()
end)