exceeding maximum animation track limit?

local forward = script.Forward
local left = script.Left
local right = script.Right
local run = script.Run
local back = script.Back
local forwardvel = script.Parent.Parent.Parent.Forward
local angler = script.Parent.Parent.Parent.Turn



while true do
    wait()
    if forward.Value == true then
        run.Value = false
        back.Value = false
        --play an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Play()
        -------------------------------------------------------------------
        forwardvel.Velocity = script.Parent.Parent.Parent.CFrame.LookVector * 15
    elseif forward.Value == false and back.Value == false then
        --stop an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Stop()
        -------------------------------------------------------------------
        forwardvel.Velocity = Vector3.new(0,0,0)
    end



    if left.Value == true then
        right.Value = false
        --play an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Play()
        -------------------------------------------------------------------
        angler.AngularVelocity = Vector3.new(0,2,0)
    elseif left.Value == false and right.Value == false then
        --stop an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Stop()
        -------------------------------------------------------------------
        angler.AngularVelocity = Vector3.new(0,0,0)
    end



    if right.Value == true then
        left.Value = false
        --play an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Play()
        -------------------------------------------------------------------
        angler.AngularVelocity = Vector3.new(0,-2,0)
    elseif right.Value == false and left.Value == false then
        --stop an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Stop()
        -------------------------------------------------------------------
        angler.AngularVelocity = Vector3.new(0,0,0)
    end



    if run.Value == true then
        forward.Value = false
        --play an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim2 = script.Parent.Parent.Parent.Animations.Run
        local loaded2 = controller:LoadAnimation(chosenanim2)
        loaded2:Play()
        -------------------------------------------------------------------
        forwardvel.Velocity = script.Parent.Parent.Parent.CFrame.LookVector * 30
    end



    if back.Value == true then
        forward.Value = false
        run.Value = false
        --play an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Play()
        -------------------------------------------------------------------
        forwardvel.Velocity = script.Parent.Parent.Parent.CFrame.LookVector * -5
    elseif back.Value == false and forward.Value == false then
        --stop an animation------------------------------------------------
        local controller = script.Parent.Parent.Parent.Parent.AnimationController
        local chosenanim = script.Parent.Parent.Parent.Animations.Walk
        local loaded = controller:LoadAnimation(chosenanim)
        loaded:Stop()
        -------------------------------------------------------------------
        forwardvel.Velocity = Vector3.new(0,0,0)
    end



end

this script manages controls for an npc, if certain values are turned on or off this script performs actions. after adding animations for the npc to use I noticed an error:“AnimationTrack limit of 256 tracks for one animator exceeded. no new tracks will be played”. what is the cause and how can I fix it?