How do I fix the press e to chat?

key bind script (in starter gui, with image button, (in image button there is uiaspectratioconstraint, local script, and two text labels)) key bind is in local script:

local UIS = game:GetService("UserInputService") -- Service used to get the key pressed by a player
UIS.InputBegan:connect(function(input,gameProcessed)
    if input.UserInputType == Enum.UserInputType.Keyboard then -- Checks if the player uses a Keyboard
        if input.KeyCode == Enum.KeyCode.E then -- Checks if the player pressed the "E" key
            if UIS:GetFocusedTextBox() == nil then -- Checks if the player is typing on a textbox like the chat... If not then...
                for i,v in pairs(game.Workspace.NPCS:GetChildren()) do -- Finds all the children from the folder. In this case it will find all the NPCs
                    local mag = (v.Torso.Position-game.Players.LocalPlayer.Character.HumanoidRootPart.Position).magnitude -- Makes a variable for the position between the character and the npc.
                    if mag <= 10 then -- If the magnitude is less than or equal to 10 studs then
                        --Effect XD
                        for i = 1,0.6,-0.05 do
                            wait()
                            script.Parent.ImageColor3 = Color3.new(i,i,i)
                        end
                        wait()
                        for i = 0.6,1,0.05 do
                            wait()
                            script.Parent.ImageColor3 = Color3.new(i,i,i)
                        end
                        --This effect is like when you pressed a button it will darken.
                        v.NPCTalk:FireServer()
                    end
                end
            end
        end
    end
end)

while wait() do
    script.Parent.Visible = false -- Makes it invisible on screen
    for i,v in pairs(game.Workspace.NPCs:GetChildren()) do -- Finds all the children from the folder. In this case it will find all the NPCs
        local mag = (v.Torso.Position-game.Players.LocalPlayer.Character.HumanoidRootPart.Position).magnitude -- Makes a variable for the position between the character and the npc.
        if mag <= 10 then -- If the magnitude is less than or equal to 10 studs then
            local WSP = game.Workspace.CurrentCamera:WorldToScreenPoint(v.Torso.Position) -- The position of the NPC's Torso to 2d
            script.Parent.Visible = true
            script.Parent.Position = UDim2.new(0,WSP.X,0,WSP.Y)
            script.Parent.TextLabel.Text = "to chat with "..v.Name -- Refreshes the text and puts the name of the npc
        end
    end
end

in dummy in gui, in textbutton

script.Parent.NPCTalk.OnServerEvent:connect(function(player)
    if not player.PlayerGui:FindFirstChild("") then -- Checks if the player already has the gui. Put your gui name between the quotation marks to the name of your GUI
        local gui = script.Parent:FindFirstChild(""):Clone() -- Change here too. Clones the gui
        gui.Parent = player.PlayerGui -- Clone the gui and put its parent to the player gui.
    end
end)