The UWorld class contains a declaration for UWorld::UpdateWorldStreamingState in World.h, but there is no implementation in World.cpp, and no reference to UpdateWorldStreamingState anywhere else in the Engine.
The implementation was removed from World.cpp in CL# 1710281.
Head over to the existing Questions & Answers thread and let us know what's up.
| 0 | 
| Component | UE - Gameplay | 
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| Affects Versions | 4.6, 4.7 | 
| Fix Commit | 2356791 | 
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| Created | Nov 11, 2014 | 
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| Resolved | Nov 12, 2014 | 
| Updated | Jun 23, 2018 |