Cannot set a character's name, lacking permission 4?

I am trying to make a game about the anime "Shingeki no Kyojin". I have some character models for some of the characters and I am trying to make a dev panel where you can switch from 1 character to another. The problem is since i need the character's name to match the players name for other scripts i need to make, if you switch from one character to another, you cant switch back to the one you first selected. I dont even know how to fix this.

Srry if the script is bad i've been scripting for about 1 year 4 months now.

local CharacterEvents = game.ReplicatedStorage.CharacterEvents
local Characters = game.ReplicatedStorage.Characters

local ErenModel = Characters.Eren:Clone()
local ArminModel = Characters.Armin:Clone()

CharacterEvents.Eren.OnServerEvent:Connect(function(player)

    local PlayerPos = workspace:WaitForChild(player.Name):GetPrimaryPartCFrame()

    ErenModel.Name = player.Name
    player.Character = ErenModel
    ErenModel.Parent = workspace
    ErenModel:SetPrimaryPartCFrame(PlayerPos)
end)

CharacterEvents.Armin.OnServerEvent:Connect(function(player)
    local PlayerPos = workspace:WaitForChild(player.Name):GetPrimaryPartCFrame()

    ArminModel.Name = player.Name
    player.Character = ArminModel
    ArminModel.Parent = workspace
    ArminModel:SetPrimaryPartCFrame(PlayerPos)
end)