ContextActionsService issue when trying to play script? SOLVED With the help of brokenVectors

There are a lot of issues with your code.

1. Almost 70% of all your lines are just creating trails and editing their properties. You can make an array of all the player's limbs, and parent the trails to them.

2. You're connecting the function inside of the function, which makes absolutely no sense and it doesn't work.

3. You also have an event inside of the function that's connected, which also makes no sense??? This will cause memory leaks and it's just useless.

4. :remove() is deprecated. Use :Destroy() instead.

5. You're defining the player twice.

6. You're redefining the character???

7. CharacterAdded isn't written correctly, thanks @Dovydas118 for noticing lol

8. You're using the second parameter of Instance.new, which parents the object even before you change any properties, which then fires all the Changed events(decreases performance a ton)

Note that I didn't fix every single issue, I'll leave that up to u. Please tell me if anything doesn't work.

local player = game.Players.LocalPlayer

local Char = player.Character or player.CharacterAdded:Wait()
local UIS = game:GetService("UserInputService")
local humanoid = player.Character:WaitForChild("Humanoid")
local context = game:GetService("ContextActionService")

local debounce = false
local cooldown = 1 -- Time to wait between 2 dash

local anim = Instance.new("Animation")
anim.AnimationId = "http://www.roblox.com/asset/?id=5311749838"--Insert ID here
local function Onbuttonpress()
	
	
		if debounce == false then
			debounce = true
			local playAnim = humanoid:LoadAnimation(anim)
			playAnim:Play()
			local Character = game.Workspace:WaitForChild(player.Name)
			Char.HumanoidRootPart.Velocity = Char.HumanoidRootPart.CFrame.lookVector*500
			local Trail1 = Instance.new("Trail",Character)
			Trail1.Attachment0 = Character.RightFoot:FindFirstChildOfClass("Attachment")
			Trail1.Attachment1 = Character.RightLowerLeg:FindFirstChildOfClass("Attachment")
			Trail1.Lifetime = 0.2
			Trail1.MaxLength = 1
			Trail1.WidthScale = NumberSequence.new(0.8)
			Trail1.FaceCamera = false
			local Trail2 = Instance.new("Trail",Character)
			Trail2.Attachment0 = Character.LeftFoot:FindFirstChildOfClass("Attachment")
			Trail2.Attachment1 = Character.LeftLowerLeg:FindFirstChildOfClass("Attachment")
			Trail2.Lifetime = 0.2
			Trail2.MaxLength = 0.5
			Trail2.WidthScale = NumberSequence.new(0.8)
			Trail2.FaceCamera = false
			local Trail3 = Instance.new("Trail",Character)
			Trail3.Attachment0 = Character.LeftLowerArm:FindFirstChildOfClass("Attachment")
			Trail3.Attachment1 = Character.LeftHand:FindFirstChildOfClass("Attachment")
			Trail3.Lifetime = 0.2
			Trail3.MaxLength = 0.5
			Trail3.WidthScale = NumberSequence.new(0.8)
			Trail3.FaceCamera = false
			local Trail4 = Instance.new("Trail",Character)
			Trail4.Attachment0 = Character.RightLowerArm:FindFirstChildOfClass("Attachment")
			Trail4.Attachment1 = Character.RightHand:FindFirstChildOfClass("Attachment")
			Trail4.Lifetime = 0.25
			Trail4.MaxLength = 0.5
			Trail4.WidthScale = NumberSequence.new(0.8)
			Trail4.FaceCamera = false
			local Trail5 = Instance.new("Trail",Character)
			Trail5.Attachment0 = Character.UpperTorso:FindFirstChildOfClass("Attachment")
			Trail5.Attachment1 = Character.LowerTorso:FindFirstChildOfClass("Attachment")
			Trail5.Lifetime = 0.25
			Trail5.MaxLength = 0.5
			Trail5.WidthScale = NumberSequence.new(0.8)
			Trail5.FaceCamera = false
			wait(.5)
			for i = 0,1, .1 do
				Trail1.Transparency = NumberSequence.new(i)
				Trail2.Transparency = NumberSequence.new(i)
				Trail3.Transparency = NumberSequence.new(i)
				Trail4.Transparency = NumberSequence.new(i)
				Trail5.Transparency = NumberSequence.new(i)
				wait()
			end
			Trail1:Destroy()
			Trail2:Destroy()
			Trail3:Destroy()
			Trail4:Destroy()
			Trail5:Destroy()
			wait(cooldown)
			debounce = false
		end
			

	end
	end)
	end
context:BindAction("Startdash", Onbuttonpress, true, "q")
context:SetTitle("Startdash", "Dash")
context:SetPosition("Onbuttonpress", UDim2.new(0.628, 0,0.767, 0))

Hope this helped