Unity Monetization初始化报错Arial.ttf无效，需改用LegacyRuntime.ttf怎么修复？

当调用Monetization.Initialize(gameId, testMode)（底层实际调用Advertisement.Initialize）时，触发字体引用错误，提示信息如下：

ArgumentException: Arial.ttf is no longer a valid built in font. Please use LegacyRuntime.ttf

完整错误栈：

ArgumentException: Arial.ttf is no longer a valid built in font. Please use LegacyRuntime.ttf
UnityEngine.Advertisements.Placeholder.CreateButton (UnityEngine.GameObject canvasGameObject, System.Int32 x, System.Int32 y, System.Int32 width, System.Int32 height, UnityEngine.Vector2 anchorMin, UnityEngine.Vector2 anchorMax, System.String buttonText, UnityEngine.Events.UnityAction onButtonClick) (at <91220002a2fd403abd0d44e0c6cd5f2c>:0)
UnityEngine.Advertisements.Placeholder.CreatePlaceholder (UnityEngine.GameObject canvasGameObject, UnityEngine.Texture2D texture, System.Int32 textureWidth, System.Int32 textureHeight) (at <91220002a2fd403abd0d44e0c6cd5f2c>:0)
UnityEngine.Advertisements.Placeholder.Awake () (at <91220002a2fd403abd0d44e0c6cd5f2c>:0)
UnityEngine.Advertisements.Advertisement:Initialize(String, Boolean)
Starter:StartMonetization() (at Assets/Scripts/POBSystem/Starter.cs:402)
<Start>d__140:MoveNext() (at Assets/Scripts/POBSystem/Starter.cs:385)
System.Runtime.CompilerServices.MoveNextRunner:Run()
UniRx.Async.Internal.ReusablePromise:TryInvokeContinuation() (at Assets/UniRx.Async/Internal/ReusablePromise.cs:102)
UniRx.Async.Internal.ReusablePromise:TrySetResult() (at Assets/UniRx.Async/Internal/ReusablePromise.cs:89)
UniRx.Async.DelayPromise:MoveNext() (at Assets/UniRx.Async/UniTask.Delay.cs:155)
UniRx.Async.Internal.PlayerLoopRunner:Run() (at Assets/UniRx.Async/Internal/PlayerLoopRunner.cs:67)
UniRx.Async.<>c__DisplayClass8_0:<InsertRunner>b__1() (at Assets/UniRx.Async/PlayerLoopHelper.cs:91)

修复步骤 #

• 更新Unity Ads插件到最新版
  这个错误源于旧版Unity Ads插件仍在引用Unity已废弃的内置Arial字体。打开Package Manager，找到Unity Ads（或命名为Advertisements），点击更新到官方最新稳定版本，新版本已替换为LegacyRuntime.ttf或适配了Unity新字体系统。

• 手动修改插件代码（无法更新包时）
  如果项目兼容性限制不能升级插件，可手动修改：

  1. 在Project窗口搜索Placeholder.cs（属于Unity Ads插件的核心脚本）
  2. 打开脚本后，找到创建Text组件时指定"Arial.ttf"的代码行
  3. 将其替换为"LegacyRuntime.ttf"，保存后重新编译项目

• 检查版本兼容性
  确保Unity Editor版本与Unity Ads包版本匹配，部分旧版Editor搭配新版Ads包也可能出现资源引用冲突，尽量使用官方推荐的版本组合。

内容的提问来源于stack exchange，提问作者Gabriel Alabi