I'm getting a "LoadAnimation requires the asset id to not be empty" Error can someone please help?

local rp = game:GetService("ReplicatedStorage")
local Sword = rp:WaitForChild("Sword")

local cframes = {
	["Right Arm"] = CFrame.new(0,-1,0),
	["RightHand"] = CFrame.new(0,0,0)
}

Sword.OnServerEvent:Connect(function(Player,isEquipped)
	local Character = Player.Character
	local Humanoid = Character.Humanoid

	if isEquipped then
		--Equipping the sword
		local equipAnim
		if Humanoid.RigType == Enum.HumanoidRigType.R15 then
			equipAnim = Humanoid.Animator:LoadAnimation(script.R15.Equip) -- Error
		elseif Humanoid.RigType == Enum.HumanoidRigType.R6 then
			equipAnim = Humanoid.Animator:LoadAnimation(script.R6.Equip) -- Error
		end
		equipAnim:Play()
		
		local Katana = Character:FindFirstChild("Katana")
		if Katana then
			local SideWeld = Katana.PrimaryPart:FindFirstChild("SideWeld")
			if SideWeld then
				SideWeld:Destroy()

				if Humanoid.RigType == Enum.HumanoidRigType.R15 then
					Katana:SetPrimaryPartCFrame(Character:WaitForChild("RightHand").CFrame * cframes.RightHand)
					
				elseif Humanoid.RigType == Enum.HumanoidRigType.R6 then
					Katana:SetPrimaryPartCFrame(Character:WaitForChild("Right Arm").CFrame * cframes["Right Arm"])

				end

				local HandWeld = Instance.new("ManualWeld")
				HandWeld.Name = "HandWeld"
				HandWeld.Part0 = Katana.PrimaryPart

				if Humanoid.RigType == Enum.HumanoidRigType.R15 then
					HandWeld.Part1 = Character:WaitForChild("RightHand")
					
				elseif Humanoid.RigType == Enum.HumanoidRigType.R6 then
					HandWeld.Part1 = Character:WaitForChild("Right Arm")
				end

				HandWeld.C0 = HandWeld.Part0.CFrame:ToObjectSpace(HandWeld.Part1.CFrame)
				HandWeld.Parent = HandWeld.Part0

			end
		end
	elseif not isEquipped then
		--Unequipping the sword
		local Katana = Character:FindFirstChild("Katana")
		if Katana then
			local Handweld = Katana.PrimaryPart:FindFirstChild("HandWeld")
			if Handweld then
				Handweld:Destroy()
				
				local Case = Character:FindFirstChild("Case")
				if Case then
					Katana:SetPrimaryPartCFrame(Case.Case.CFrame * CFrame.new(0,-.125,2.65))
					
					local weld2 = Instance.new("ManualWeld")
					weld2.Name = "SideWeld"
					weld2.Part0 = Katana.PrimaryPart
					weld2.Part1 = Case.PrimaryPart
					weld2.C0 = weld2.Part0.CFrame:ToObjectSpace(weld2.part1.CFrame)
					weld2.Parent = weld2.Part0
					
					Sword:FireClient(Player)
				end
			end
		end
	end

end)