我们来谈谈微软的大坑：当打开hololens项目文件的时候，报错：
The ‘UXTools’ plugin was designed for build 5.0.3. Attempt to load it anyway?
‘GraphicsToolsExamples’ is Incompatible
The ‘GraphicsToolsExamples’ plugin was designed for build 5.0.3. Attempt to load it anyway?
但是不影响项目运行，可是打包的时候会报错：
UATHelper: 打包 (HoloLens): LogBlueprint: Error: [AssetLog] E:\UEPJSPEED\DELTEST0308\Content\config1\MRPAWNnew.uasset: [Compiler] 生成节点 生成Actor NONE 必须指定一个 Class 。 from Source: /Game/config1/MRPAWNnew.MRPAWNnew
UATHelper: 打包 (HoloLens): LogBlueprint: Error: [AssetLog] E:\UEPJSPEED\DELTEST0308\Content\config1\MRPAWNnew.uasset: [Compiler] 生成节点 生成Actor NONE 必须指定一个 Class 。 from Source: /Game/config1/MRPAWNnew.MRPAWNnew
PackagingResults: Warning: Plugin ‘UXTools’ is not compatible with the current engine version (5.0.3)
PackagingResults: Warning: Engine version string in E:/UEPJSPEED/DELTEST0308/Plugins/GraphicsTools/GraphicsTools.uplugin could not be parsed (“5.0”)
PackagingResults: Warning: Plugin ‘GraphicsToolsExamples’ is not compatible with the current engine version (5.0.3)
PackagingResults: Error: [AssetLog] E:\UEPJSPEED\DELTEST0308\Content\config1\MRPAWNnew.uasset: [Compiler] 生成节点 生成Actor NONE 必须指定一个 Class 。 from Source: /Game/config1/MRPAWNnew.MRPAWN
PackagingResults: Error: [AssetLog] E:\UEPJSPEED\DELTEST0308\Content\config1\MRPAWNnew.uasset: [Compiler] 生成节点 生成Actor NONE 必须指定一个 Class 。 from Source: /Game/config1/MRPAWNnew.MRPAWN
Display: LogBlueprint: Error: [AssetLog] E:\UEPJSPEED\DELTEST0308\Content\config1\MRPAWNnew.uasset: [Compiler] 生成节点 生成Actor NONE 必须指定一个 Class 。 from Source: /Game/config1/MRPAWNnew.MRPAWN
最终提示：
UATHelper: 打包 (HoloLens): ERROR: Cook failed.
UATHelper: 打包 (HoloLens): (see C:\Users\XXXXX\AppData\Roaming\Unreal Engine\AutomationTool\Logs\E+unreal+UE_5.0\Log.txt for full exception trace)
UATHelper: 打包 (HoloLens): Autom+ationTool executed for 0h 0m 18s
UATHelper: 打包 (HoloLens): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: 打包 (HoloLens): BUILD FAILED
PackagingResults: Error: Unknown Cook Failure
于是打包失败
一开始看不出来是为什么失败了，为什么打包错误，最终发现是插件并未正常打包，导致有缺失，实际上和项目没有任何关系。
解决办法是：用文本编辑器打开插件目录下的UXTools.uplugin，修改”EngineVersion”: “5.0.3”这段话
但是我明明把 “EngineVersion”: “5.0.3”修改成了我当前的版本5.0.3，还是会弹出提示窗口：
最后发现把
GraphicsTools.uplugin
GraphicsToolsExamples.uplugin
UXTools.uplugin
里面所有的引擎版本修改为： “EngineVersion”: “5.0.0”
OK，打开项目插件完全正常加载，解决问题 。
打包成功