getting variables from a cpp/h file to be read by another cpp file

Development Programming & Scripting C++
3

I tried that a little later after some research, I found this site

I followed it to the letter but its not recognizing UMyAnimInstanceClass in the character class.

PlayerCharacter.cpp



void APlayerCharacter::TurnAtRate(float Rate)
{
	// calculate delta for this frame from the rate information
	AddControllerYawInput(Rate * BaseTurnRate * GetWorld()->GetDeltaSeconds());
	UMyAnimInstance * Animation = Cast<UMyAnimInstance>(Mesh->GetAnimInstance());
	Animation->AimRight += Rate * BaseTurnRate * GetWorld()->GetDeltaSeconds();
}

MyAnimInstance.h


#pragma once

#include "Animation/AnimInstance.h"
#include "MyAnimInstance.generated.h"

/**
*
*/
UCLASS(transient, Blueprintable, hideCategories = AnimInstance, BlueprintType)
class UMyAnimInstance : public UAnimInstance
{
	GENERATED_UCLASS_BODY()

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Gameplay)
		float AimUp;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Gameplay)
		float AimRight;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Gameplay)
		bool Running;
	
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Gameplay)
		bool Jumping;
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Gameplay)
                float AnimationNumber 
};

is there something im missing?