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Weird LINK2001 and 2019 error

Whenever I compile the code, these two errors appear:

LNK2001 unresolved external symbol "public: __cdecl UKeybindingUMG::UKeybindingUMG(class FObjectInitializer const &)" (??0UKeybindingUMG@@QEAA@AEBVFObjectInitializer@@@Z)

LNK2019 unresolved external symbol "public: __cdecl UKeybindingUMG::UKeybindingUMG(class FObjectInitializer const &)" (??0UKeybindingUMG@@QEAA@AEBVFObjectInitializer@@@Z) referenced in function "public: void __cdecl UKeybindingUMG::`default constructor closure'(void)" (??_FUKeybindingUMG@@QEAAXXZ)

KeybindingUMG.cpp:

 // Fill out your copyright notice in the Description page of Project Settings.
 
 #include "KeybindingUMG.h"
 #include "Project.h"

KeybindingUMG.h:

 // Fill out your copyright notice in the Description page of Project Settings.
 
 #pragma once
 
 #include "CoreMinimal.h"
 #include "Blueprint/UserWidget.h"
 #include "KeybindingUMG.generated.h"
 
 /**
  * 
  */
 UCLASS()
 class PROJECT_API UKeybindingUMG: public UUserWidget
 {
     GENERATED_UCLASS_BODY()
 };
 

I can't find anything contextually wrong from this. It would be great if anyone can tell me what have I done wrong.

Product Version: UE 4.18
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asked May 23 '18 at 11:38 PM in C++ Programming

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Paul_LTC
30 3 3 9

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2 answers: sort voted first

Using old GENERATED_UCLASS_BODY() requires you to create constructor in same formul as linking error suggesting, the constructor is called in generated code thats why you don't see it.

Use new GENERATED_BODY() instead it does not require any constructor the old macro probably will be deprecated sooner or later, just remember with this one you need ot place "public:" as by default any feather declarations in class will be private by default

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answered May 23 '18 at 11:48 PM

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Shadowriver
36.5k 930 169 1111

avatar image Paul_LTC May 24 '18 at 01:31 AM

Thanks! This saved me from several hours of debugging haha

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As you're using GENERATED_UCLASS_BODY(), you should provide a constructor in your .cpp file.

If you don't want to write a constructor, you can use GENERATED_BODY() instead

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answered May 23 '18 at 11:48 PM

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phil_me_up
1.5k 6 6 12

avatar image Paul_LTC May 24 '18 at 01:31 AM

Thanks! This saved me from several hours of debugging haha

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