Why does the script to change the player arms and legs not work?

the script is supposed to change the players arms and legs and body to something more noob like the error I get is

Unable to assign property MeshId. Script write access is restricted

local function onPartTouched(otherPart)

    local partParent = otherPart.Parent

    local humanoid = partParent:FindFirstChildWhichIsA("Humanoid")
    if humanoid then

        local Root = otherPart.Parent.HumanoidRootPart
        otherPart.Parent.LeftFoot.Meshid = 'http://www.roblox.com/asset/?id=1699715602'
        otherPart.Parent.LeftHand.Meshid = 'http://www.roblox.com/asset/?id=1699715537'
        otherPart.Parent.LeftLowerArm.Meshid = 'http://www.roblox.com/asset/?id=1699715541'
        otherPart.Parent.LeftLowerLeg.Meshid = 'http://www.roblox.com/asset/?id=1699715610'
        otherPart.Parent.LeftUpperArm.Meshid = 'http://www.roblox.com/asset/?id=1699715550'
        otherPart.Parent.LeftUpperLeg.Meshid = 'http://www.roblox.com/asset/?id=1699715616'
        otherPart.Parent.LowerTorso.Meshid = 'http://www.roblox.com/asset/?id=1699715652'
        otherPart.Parent.RightFoot.Meshid = 'http://www.roblox.com/asset/?id=1699715627'
        otherPart.Parent.RightHand.Meshid = 'http://www.roblox.com/asset/?id=1699715557'
        otherPart.Parent.RightLowerArm.Meshid = 'http://www.roblox.com/asset/?id=1699715562'
        otherPart.Parent.RightLowerLeg.Meshid = 'http://www.roblox.com/asset/?id=1699715632'
        otherPart.Parent.RightUpperArm.Meshid = 'http://www.roblox.com/asset/?id=1699715576'
        otherPart.Parent.RightUpperLeg.Meshid = 'http://www.roblox.com/asset/?id=1699715641'
        otherPart.Parent.UpperTorso.Meshid = 'http://www.roblox.com/asset/?id=1699715593'
        otherPart.Parent.UpperTorso.Mesh.MeshType = 'Head'



    end
end

script.Parent.Touched:Connect(onPartTouched)