Error extending physics constraint actor

Development World Creation
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Error 1 error LNK2001: unresolved external symbol “public: virtual void __cdecl APhysicsConstraintActor::PostLoad(void)” (?PostLoad@APhysicsConstraintActor@@UEAAXXZ) G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Intermediate\ProjectFiles\MyPhysicsConstraintActor.cpp.obj UMGInventoryDemoS
Error 2 error LNK2001: unresolved external symbol “public: virtual void __cdecl APhysicsConstraintActor::PostLoad(void)” (?PostLoad@APhysicsConstraintActor@@UEAAXXZ) G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Intermediate\ProjectFiles\MyPhysicsConstraintActor2.cpp.obj UMGInventoryDemoS
Error 3 error LNK2001: unresolved external symbol “public: virtual void __cdecl APhysicsConstraintActor::PostLoad(void)” (?PostLoad@APhysicsConstraintActor@@UEAAXXZ) G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Intermediate\ProjectFiles\UMGInventoryDemoS.generated.cpp.obj UMGInventoryDemoS
Error 4 error LNK2001: unresolved external symbol “public: virtual void __cdecl APhysicsConstraintActor::LoadedFromAnotherClass(class FName const &)” (?LoadedFromAnotherClass@APhysicsConstraintActor@@UEAAXAEBVFName@@@Z) G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Intermediate\ProjectFiles\MyPhysicsConstraintActor.cpp.obj UMGInventoryDemoS
Error 5 error LNK2001: unresolved external symbol “public: virtual void __cdecl APhysicsConstraintActor::LoadedFromAnotherClass(class FName const &)” (?LoadedFromAnotherClass@APhysicsConstraintActor@@UEAAXAEBVFName@@@Z) G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Intermediate\ProjectFiles\MyPhysicsConstraintActor2.cpp.obj UMGInventoryDemoS
Error 6 error LNK2001: unresolved external symbol “public: virtual void __cdecl APhysicsConstraintActor::LoadedFromAnotherClass(class FName const &)” (?LoadedFromAnotherClass@APhysicsConstraintActor@@UEAAXAEBVFName@@@Z) G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Intermediate\ProjectFiles\UMGInventoryDemoS.generated.cpp.obj UMGInventoryDemoS
Error 7 error LNK1120: 2 unresolved externals G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Binaries\Win64\UE4Editor-UMGInventoryDemoS.dll 1 1 UMGInventoryDemoS
Error 8 error : Failed to produce item: G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Binaries\Win64\UE4Editor-UMGInventoryDemoS.dll G:\UE4 Projects 46\UMGInventoryDemoS 4.7\Intermediate\ProjectFiles\ERROR UMGInventoryDemoS
Error 9 error MSB3073: The command “G:\UnrealEngine-release\Engine\Build\BatchFiles\Build.bat UMGInventoryDemoSEditor Win64 Development “G:\UE4 Projects 46\UMGInventoryDemoS 4.7\UMGInventoryDemoS.uproject”” exited with code -1. C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets 38 5 UMGInventoryDemoS

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I ran into this one too. Any solutions?

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As it turns out the class has the “MinimalAPI” flag set which makes it impossible to extend it. One can however use the engine source code and remove that flag.
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