一般为Windows中的宏和UE4冲突所致
在模块的xxx.Build.cs 里面添加这个:
bEnableUndefinedIdentifierWarnings = false;
转自：https://blog.csdn.net/boonti/article/details/84255014?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param
标签：WINNT,C4668,relevant,10326,distribute,elif,blog From： https://www.cnblogs.com/zjr0/p/16799186.html