Unreal Engine Issues and Bug Tracker (UE-40017)

Description

Error message in log is:

CompilerResultsLog:Error: Error MyBTTask_RunBehavior.cpp.obj : error LNK2001: unresolved external symbol "public: virtual void __cdecl IGameplayTaskOwnerInterface::OnGameplayTaskActivated(class UGameplayTask &)" (?OnGameplayTaskActivated@IGameplayTaskOwnerInterface@@UEAAXAEAVUGameplayTask@@@Z)
CompilerResultsLog:Error: Error MyProject5.generated.cpp.obj : error LNK2001: unresolved external symbol "public: virtual void __cdecl IGameplayTaskOwnerInterface::OnGameplayTaskActivated(class UGameplayTask &)" (?OnGameplayTaskActivated@IGameplayTaskOwnerInterface@@UEAAXAEAVUGameplayTask@@@Z)
CompilerResultsLog:Error: Error D:\MyProjects\MyProject5\Binaries\Win64\UE4Editor-MyProject5-2154.dll : fatal error LNK1120: 1 unresolved externals

This is not a regression.

Steps to Reproduce

Create a new C++ Project
Right click in the Content Browser and select New C++ Class
Enable the checkbox to see all classes
Search for 'Behavior' and select the BTTask_RunBehavior class
Click Next and then click Create Class

Result: Compile failure

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By Design

Component	UE - AI
Affects Versions	4.13.2, 4.14.2, 4.15, 4.16

Created	Dec 22, 2016
Resolved	Jun 15, 2017
Updated	Apr 27, 2018

UE-40017

Compile failure adding BTTask_RunBehavior C++ class to project

Compile failure adding BTTask_RunBehavior C++ class to project

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