这是别人（http://blog.csdn.net/z609932088/article/details/52368015）写的，亲试可用

如下图

百度许久，有大神指出是我在编译源码的的时候没有将其中的某个模块编译进去，只需要重新编译摸个模块就好

在UE4 的sln文件下，会看到一个UnrealLightmass的模块，选中，鼠标邮件生成，等待编译完成就好了

如下图

再次打开UE4验证

ok，可以完美运行

下面是编译log，如果在编译源码有问题，可以看一下坐下参考

[cpp]   

1. 1>------ 已启动生成: 项目: EnvVarsToXML, 配置: Development Any CPU ------  
2. 2>------ 已启动生成: 项目: DotNETUtilities, 配置: Development Any CPU ------  
3. 1>  EnvVarsToXML -> D:\UnrealEngine\Engine\Binaries\DotNET\EnvVarsToXML.exe  
4. 2>  DotNETUtilities -> D:\UnrealEngine\Engine\Binaries\DotNET\DotNETUtilities.dll  
5. 3>------ 已启动生成: 项目: UnrealBuildTool, 配置: Development Any CPU ------  
6. 3>  UnrealBuildTool -> D:\UnrealEngine\Engine\Binaries\DotNET\UnrealBuildTool.exe  
7. 4>------ 已启动生成: 项目: UnrealLightmass, 配置: Development_Program x64 ------  
8. 4>  Creating makefile for UnrealLightmass (no existing makefile)  
9. 4>  Performing full C++ include scan (no include cache file)  
10. 4>  Building UnrealHeaderTool...  
11. 4>  Creating makefile for UnrealHeaderTool (UnrealBuildTool.exe is newer)  
12. 4>  Target is up to date  
13. 4>  Parsing headers for UnrealLightmass  
14. 4>    Running UnrealHeaderTool UnrealLightmass "D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -NoEnginePlugins  
15. 4>  Reflection code generated for UnrealLightmass in 0.4688833 seconds  
16. 4>  Performing 71 actions (4 in parallel)  
17. 4>  [4/71] Resource ModuleVersionResource.rc.inl  
18. 4>  PCH.Core.h.cpp  
19. 4>  PCH.CoreUObject.h.cpp  
20. 4>  PCH.CorePrivatePCH.h.cpp  
21. 4>  [5/71] Resource PCLaunch.rc  
22. 4>  [6/71] Resource ModuleVersionResource.rc.inl  
23. 4>  [7/71] Resource PCLaunch.rc  
24. 4>  [8/71] Resource ModuleVersionResource.rc.inl  
25. 4>  [9/71] Resource PCLaunch.rc  
26. 4>  CoreUObject.generated.cpp  
27. 4>  Module.Json.cpp  
28. 4>  Module.Core.8_of_8.cpp  
29. 4>  Module.Core.7_of_8.cpp  
30. 4>  Module.Core.6_of_8.cpp  
31. 4>  Module.Core.5_of_8.cpp  
32. 4>  Module.Core.4_of_8.cpp  
33. 4>  Module.Core.2_of_8.cpp  
34. 4>  Module.Core.1_of_8.cpp  
35. 4>  Module.Core.3_of_8.cpp  
36. 4>  Module.Projects.cpp  
37. 4>  Module.CoreUObject.5_of_5.cpp  
38. 4>  Module.CoreUObject.3_of_5.cpp  
39. 4>  [23/71] Resource ModuleVersionResource.rc.inl  
40. 4>  Module.CoreUObject.2_of_5.cpp  
41. 4>  [25/71] Link UnrealLightmass-Core.dll  
42. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Core.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Core.exp  
43. 4>  [26/71] Link UnrealLightmass-Json.dll  
44. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Json.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Json.exp  
45. 4>  [27/71] Link UnrealLightmass-Projects.dll  
46. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Projects.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Projects.exp  
47. 4>  Module.CoreUObject.1_of_5.cpp  
48. 4>  [29/71] Resource PCLaunch.rc  
49. 4>  Module.CoreUObject.4_of_5.cpp  
50. 4>  Module.SandboxFile.cpp  
51. 4>  [32/71] Resource PCLaunch.rc  
52. 4>  [33/71] Resource ModuleVersionResource.rc.inl  
53. 4>  [34/71] Link UnrealLightmass-SandboxFile.dll  
54. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SandboxFile.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SandboxFile.exp  
55. 4>  Module.Sockets.cpp  
56. 4>  [36/71] Resource ModuleVersionResource.rc.inl  
57. 4>  [37/71] Resource PCLaunch.rc  
58. 4>  [38/71] Link UnrealLightmass-Sockets.dll  
59. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Sockets.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Sockets.exp  
60. 4>  Module.SwarmInterface.cpp  
61. 4>  Module.Networking.cpp  
62. 4>  Serialization.generated.cpp  
63. 4>  SwarmInterface.generated.cpp  
64. 4>  Module.Serialization.cpp  
65. 4>  Module.Messaging.cpp  
66. 4>  [45/71] Resource ModuleVersionResource.rc.inl  
67. 4>  [46/71] Resource PCLaunch.rc  
68. 4>  [47/71] Resource PCLaunch.rc  
69. 4>  [48/71] Resource PCLaunch.rc  
70. 4>  [49/71] Resource PCLaunch.rc  
71. 4>  [50/71] Resource ModuleVersionResource.rc.inl  
72. 4>  [51/71] Resource ModuleVersionResource.rc.inl  
73. 4>  [52/71] Resource ModuleVersionResource.rc.inl  
74. 4>  [53/71] Link UnrealLightmass-Networking.dll  
75. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Networking.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Networking.exp  
76. 4>  Module.DerivedDataCache.cpp  
77. 4>  UdpMessaging.generated.cpp  
78. 4>  Module.UdpMessaging.cpp  
79. 4>  Module.UnrealLightmass.2_of_3.cpp  
80. 4>  Module.UnrealLightmass.3_of_3.cpp  
81. 4>  Module.UnrealLightmass.1_of_3.cpp  
82. 4>  [60/71] Resource Resource.rc  
83. 4>  [61/71] Resource ModuleVersionResource.rc.inl  
84. 4>  [62/71] Resource PCLaunch.rc  
85. 4>  [63/71] Resource PCLaunch.rc  
86. 4>  [64/71] Resource ModuleVersionResource.rc.inl  
87. 4>  [65/71] Link UnrealLightmass-DerivedDataCache.dll  
88. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-DerivedDataCache.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-DerivedDataCache.exp  
89. 4>  [66/71] Link UnrealLightmass-CoreUObject.dll  
90. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-CoreUObject.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-CoreUObject.exp  
91. 4>  [67/71] Link UnrealLightmass-Serialization.dll  
92. 4>  [68/71] Link UnrealLightmass-SwarmInterface.dll  
93. 4>  [69/71] Link UnrealLightmass-Messaging.dll  
94. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Messaging.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Messaging.exp  
95. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SwarmInterface.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-SwarmInterface.exp  
96. 4>    正在创建库 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Serialization.lib 和对象 D:\UnrealEngine\Engine\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-Serialization.exp  
97. 4>  [70/71] Link UnrealLightmass.exe  
98. 4>  [71/71] Link UnrealLightmass-UdpMessaging.dll  
99. 4>    正在创建库 D:\UnrealEngine\Engine\Plugins\Messaging\UdpMessaging\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-UdpMessaging.lib 和对象 D:\UnrealEngine\Engine\Plugins\Messaging\UdpMessaging\Intermediate\Build\Win64\UnrealLightmass\Development\UnrealLightmass-UdpMessaging.exp  
100. 4>  Total build time: 182.27 seconds  
101. ========== 生成: 成功 4 个，失败 0 个，最新 0 个，跳过 0 个 ==========