C++ Coding Build Error (error MSB3073)

// Fill out your copyright notice in the Description page of Project Settings.

#include "Concepts.h"
#include "MyCharacter.h"


// Sets default values
AMyCharacter::AMyCharacter()
{
 	// Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

}

// Called when the game starts or when spawned
void AMyCharacter::BeginPlay()
{
	Super::BeginPlay();
	
}

// Called every frame
void AMyCharacter::Tick( float DeltaTime )
{
	Super::Tick( DeltaTime );

}

// Called to bind functionality to input
void AMyCharacter::SetupPlayerInputComponent(class UInputComponent* InputComponent)
{
	Super::SetupPlayerInputComponent(InputComponent);

}

//implement CalculateHealth
void AMyCharacter::CalculateHealth(float delta)
{
	Health += delta;
	CalculateDead();
}
//implement CalculateDead
void AMyCharacter::CalculateDead()
{
	if (Health <= 0)
		isDead = true;
	else
		isDead = false;
}
//implement PostEditChangeProperty
#if WITH_EDITOR
void AMyCharacter::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
	isDead = false;
	Health = 100;
	Super::PostEditChangeProperty(PropertyChangedEvent);
	CalculateDead();
}
#endif