如下圖
百度許久，有大神指出是我在編譯源碼的的時候沒有将其中的某個子產品編譯進去，隻需要重新編譯摸個子產品就好
在UE4 的sln檔案下，會看到一個UnrealLightmass的子產品，選中，滑鼠郵件生成，等待編譯完成就好了
ok，可以完美運作
下面是編譯log，如果在編譯源碼有問題，可以看一下坐下參考
1>------ 已啟動生成: 項目: EnvVarsToXML, 配置: Development Any CPU ------
2>------ 已啟動生成: 項目: DotNETUtilities, 配置: Development Any CPU ------
1> EnvVarsToXML -> D:\UnrealEngine\Engine\Binaries\DotNET\EnvVarsToXML.exe
2> DotNETUtilities -> D:\UnrealEngine\Engine\Binaries\DotNET\DotNETUtilities.dll
3>------ 已啟動生成: 項目: UnrealBuildTool, 配置: Development Any CPU ------
3> UnrealBuildTool -> D:\UnrealEngine\Engine\Binaries\DotNET\UnrealBuildTool.exe
4>------ 已啟動生成: 項目: UnrealLightmass, 配置: Development_Program x64 ------
4> Creating makefile for UnrealLightmass (no existing makefile)
4> Performing full C++ include scan (no include cache file)
4> Building UnrealHeaderTool...
4> Creating makefile for UnrealHeaderTool (UnrealBuildTool.exe is newer)
4> Target is up to date
4> Parsing headers for UnrealLightmass
4> Running UnrealHeaderTool UnrealLightmass "D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -NoEnginePlugins
4> Reflection code generated for UnrealLightmass in 0.4688833 seconds
4> Performing 71 actions (4 in parallel)
4> [4/71] Resource ModuleVersionResource.rc.inl
4> PCH.Core.h.cpp
4> PCH.CoreUObject.h.cpp
4> PCH.CorePrivatePCH.h.cpp
4> [5/71] Resource PCLaunch.rc
4> [6/71] Resource ModuleVersionResource.rc.inl
4> [7/71] Resource PCLaunch.rc
4> [8/71] Resource ModuleVersionResource.rc.inl
4> [9/71] Resource PCLaunch.rc
4> CoreUObject.generated.cpp
4> Module.Json.cpp
4> Module.Core.8_of_8.cpp
4> Module.Core.7_of_8.cpp
4> Module.Core.6_of_8.cpp
4> Module.Core.5_of_8.cpp
4> Module.Core.4_of_8.cpp
4> Module.Core.2_of_8.cpp
4> Module.Core.1_of_8.cpp
4> Module.Core.3_of_8.cpp
4> Module.Projects.cpp
4> Module.CoreUObject.5_of_5.cpp
4> Module.CoreUObject.3_of_5.cpp
4> [23/71] Resource ModuleVersionResource.rc.inl
4> Module.CoreUObject.2_of_5.cpp
4> [25/71] Link UnrealLightmass-Core.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Core.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Core.exp
4> [26/71] Link UnrealLightmass-Json.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Json.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Json.exp
4> [27/71] Link UnrealLightmass-Projects.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Projects.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Projects.exp
4> Module.CoreUObject.1_of_5.cpp
4> [29/71] Resource PCLaunch.rc
4> Module.CoreUObject.4_of_5.cpp
4> Module.SandboxFile.cpp
4> [32/71] Resource PCLaunch.rc
4> [33/71] Resource ModuleVersionResource.rc.inl
4> [34/71] Link UnrealLightmass-SandboxFile.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SandboxFile.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SandboxFile.exp
4> Module.Sockets.cpp
4> [36/71] Resource ModuleVersionResource.rc.inl
4> [37/71] Resource PCLaunch.rc
4> [38/71] Link UnrealLightmass-Sockets.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Sockets.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Sockets.exp
4> Module.SwarmInterface.cpp
4> Module.Networking.cpp
4> Serialization.generated.cpp
4> SwarmInterface.generated.cpp
4> Module.Serialization.cpp
4> Module.Messaging.cpp
4> [45/71] Resource ModuleVersionResource.rc.inl
4> [46/71] Resource PCLaunch.rc
4> [47/71] Resource PCLaunch.rc
4> [48/71] Resource PCLaunch.rc
4> [49/71] Resource PCLaunch.rc
4> [50/71] Resource ModuleVersionResource.rc.inl
4> [51/71] Resource ModuleVersionResource.rc.inl
4> [52/71] Resource ModuleVersionResource.rc.inl
4> [53/71] Link UnrealLightmass-Networking.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Networking.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Networking.exp
4> Module.DerivedDataCache.cpp
4> UdpMessaging.generated.cpp
4> Module.UdpMessaging.cpp
4> Module.UnrealLightmass.2_of_3.cpp
4> Module.UnrealLightmass.3_of_3.cpp
4> Module.UnrealLightmass.1_of_3.cpp
4> [60/71] Resource Resource.rc
4> [61/71] Resource ModuleVersionResource.rc.inl
4> [62/71] Resource PCLaunch.rc
4> [63/71] Resource PCLaunch.rc
4> [64/71] Resource ModuleVersionResource.rc.inl
4> [65/71] Link UnrealLightmass-DerivedDataCache.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-DerivedDataCache.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-DerivedDataCache.exp
4> [66/71] Link UnrealLightmass-CoreUObject.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-CoreUObject.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-CoreUObject.exp
4> [67/71] Link UnrealLightmass-Serialization.dll
4> [68/71] Link UnrealLightmass-SwarmInterface.dll
4> [69/71] Link UnrealLightmass-Messaging.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Messaging.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Messaging.exp
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SwarmInterface.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SwarmInterface.exp
4> 正在建立庫 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Serialization.lib 和對象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Serialization.exp
4> [70/71] Link UnrealLightmass.exe
4> [71/71] Link UnrealLightmass-UdpMessaging.dll
4> 正在建立庫 D:\UnrealEngine\Engine\Plugins\Messaging\UdpMessaging\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-UdpMessaging.lib 和對象 D:\UnrealEngine\Engine\Plugins\Messaging\UdpMessaging\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-UdpMessaging.exp
4> Total build time: 182.27 seconds
========== 生成: 成功 4 個，失敗 0 個，最新 0 個，跳過 0 個 ==========