Unresolved external symbol "__declspec(dllimport) class UScriptStruct error

Development Programming & Scripting C++
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1

I’m following a tutorial for setting up mass in my project, and I’m getting this error for a couple of my .cpp files:

0>EnemyDeathProcessor.cpp.obj: Error LNK2019 : unresolved external symbol “__declspec(dllimport) class UScriptStruct * __cdecl Z_Construct_UScriptStruct_FMassElement(enum ETypeConstructPhase)” (_imp?Z_Construct_UScriptStruct_FMassElement@@YAPEAVUScriptStruct@@W4ETypeConstructPhase@@ @Z) referenced in function “auto * __cdecl UE::StructUtils::GetAsUStruct(void)” (??$GetAsUStruct@UFMassElement@@@StructUtils@UE@@YAPEA_PXZ)

The code for the death processor, for reference:

#include "EnemyDeathProcessor.h"
#include "EnemyMassFragments.h"
#include "MassRepresentationFragments.h"

UEnemyDeathProcessor::UEnemyDeathProcessor() : EntityQuery(*this)
{
    ExecutionFlags = static_cast<uint8>(EProcessorExecutionFlags::All & ~EProcessorExecutionFlags::Client);
}

void UEnemyDeathProcessor::ConfigureQueries(const TSharedRef<FMassEntityManager>& EntityManager)
{
    // death processor should be able to read and write the death fragment
    EntityQuery.AddRequirement<FEnemyDeathFragment>(EMassFragmentAccess::ReadWrite);
    // as long as the entity is alive, its visualization will keep spawning an actor when close to the player
    EntityQuery.AddRequirement<FMassRepresentationFragment>(EMassFragmentAccess::ReadOnly);
}

void UEnemyDeathProcessor::Execute(FMassEntityManager& EntityManager, FMassExecutionContext& Context)
{
    EntityQuery.ForEachEntityChunk(Context,[](FMassExecutionContext& Ctx)
    {
       // access the fragments used
       const auto Deaths = Ctx.GetMutableFragmentView<FEnemyDeathFragment>();
       // because read only fragments cant be modified, have to access it as an array instead of a mutable
       const auto Reps = Ctx.GetFragmentView<FMassRepresentationFragment>();
       
       // iterate through fragment
       for (int i = 0; i < Ctx.GetNumEntities(); ++i)
       {
          // check if entity is currently representing an actor
          const bool bAlreadySpawnedActor = 
                Reps[i].CurrentRepresentation == EMassRepresentationType::HighResSpawnedActor ||
                Reps[i].CurrentRepresentation == EMassRepresentationType::LowResSpawnedActor;
          
          // if an already dead entity no longer represents an actor, request it be destroyed
          if (!bAlreadySpawnedActor)
          {
             Ctx.Defer().DestroyEntity(Ctx.GetEntity(i));
             continue;
          }
          
          // make entity destroy itself when specified ttl expires
          Deaths[i].TTL -= Ctx.GetDeltaTimeSeconds();
          if (Deaths[i].TTL <= 0.f)
          {
             Ctx.Defer().DestroyEntity(Ctx.GetEntity(i));
          }
       }
    });
}

I know this error can happen when you’re missing a dependency in your build.cs file, but I’m not sure what dependency I’m missing.

2

These are the dependencies I currently have:

PrivateDependencyModuleNames.AddRange(new string[]
{
    "GameplayAbilities", "GameplayTasks", "GameplayTags", 
    "DeveloperSettings", "AIModule", "NavigationSystem", "MassEntity", "MassCommon", "MassActors", "MassSpawner", 
    "MassLOD", "MassRepresentation"
});