如何修复我的 Roblox Lua 脚本？

Egor Skriptunoff 是正确的。 让我重新格式化您的 while-loop，以便您了解原因。

--播放振幅条动画
while true do
    local amplitude = math.clamp(sound.PlaybackLoudness / maxLoudness, 0, 1)
    print(80-(game.Workspace.CurrentCamera.FieldOfView))
    bar.Size = UDim2.new(sound.PlaybackLoudness / maxLoudness, 0, 0, 0)
    wait(0.00001)
    local lastLoudness = 0
    local PBS = ((sound.PlaybackLoudness/50)^(sound.PlaybackLoudness/50))

    if lastLoudness~=0 then
        local formula = math.abs((lastLoudness*15)) + ((lastLoudness+PBS)/1.9)
        if (math.abs(PBS) > formula) == true then
            game.Workspace.CurrentCamera.FieldOfView = (lastLoudness)
            if game.Workspace.CurrentCamera.FieldOfView <= 10 then
                print(formula, PBS)
            else
                game.Workspace.CurrentCamera.FieldOfView = 0
                print(formula, PBS)
            end
        end
    end
end
--这两个坏男孩与任何东西都没有关系
--只需删除它们即可摆脱错误

编辑：以下是更完整的答案，以帮助您解决其他脚本问题。 您将动画调整为0像素高，因此无法看到任何内容。

-- 位于StarterPlayer> StarterPlayerScripts

local Players = game:GetService("Players")

--等待本地播放器PlayerGui
local LocalPlayer = Players.LocalPlayer
local playerGui = LocalPlayer:WaitForChild("PlayerGui")

--创建ScreenGui
local screenGui = Instance.new("ScreenGui", playerGui)

--创建条形图的容器
local frame = Instance.new("Frame", screenGui)
frame.AnchorPoint = Vector2.new(0.0, 0.0)
frame.Position = UDim2.new(0.0, 0, 0.0, 0)
frame.Size = UDim2.new(1.0, 0, 0.0, 50) -- <---此处不再是不可见的

--创建一个条形图
local bar = Instance.new("Frame", frame)
bar.Position = UDim2.new(0, 0, 0, 0)
bar.Size = UDim2.new(1, 0, 1, 0)
bar.BackgroundColor3 = Color3.new(0, 1, 0)

--创建一个声音实例
local sound = Instance.new("Sound", screenGui)
local lastLoudness = 0
sound.SoundId = "rbxassetid://697821987"
sound.Looped = true
sound:Play()

--定义最大的噪音值
local maxLoudness = 30.0 -- <---这需要是小数值
local lastLoudness = 0

--动态播放振幅条
while true do
    -- PlaybackLoudness的值在0到500之间，因此将其缩小
    local sampledLoundness = (sound.PlaybackLoudness / 50)
    local amplitude = math.clamp(sampledLoundness / maxLoudness, 0, 1)
    print("sound values : ", sound.PlaybackLoudness, maxLoudness, amplitude)

    --动态播放条形图
    bar.Size = UDim2.new(amplitude, 0, 1, 0) -- <---这已被压缩为0像素
    wait(0.00001)

    --创建相机抖动效果
    --注意-不确定这里预期的行为是什么，它只是放大
    local PBS = sampledLoundness ^ sampledLoundness
    if lastLoudness ~=0 then
        local formula = math.abs(lastLoudness * 15) + ((lastLoudness + PBS) / 1.9)
        if (math.abs(PBS) > formula) == true then
            game.Workspace.CurrentCamera.FieldOfView = lastLoudness
            if game.Workspace.CurrentCamera.FieldOfView <= 10 then
                print("FOV is less than 10 : ", formula, PBS)
            else
                game.Workspace.CurrentCamera.FieldOfView = 0
                print("FOV forced to 0 : ", formula, PBS)
            end
        end
    end

    --更新最大噪声值，并循环
    lastLoudness = sampledLoundness
end