"cannot convert from 'UnityEngine.Vector3' to 'UnityEngine.Space" trying to rotate camera with joystick

so i want to rotate the camera horizontally with joystick but it is giving me an error.

cannot convert from 'UnityEngine.Vector3' to 'UnityEngine.Space'

transform.Rotate(Vector3.up, direction * rotationSpeed * Time.deltaTime);

if i remove Vector3.up from the code above the error goes away and i can move the camera with joystick but its rotating vertically. Any way to fix this?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class RotateCamera : MonoBehaviour
{
    public float rotationSpeed = 50.0f;
    public VariableJoystick variableJoystick;

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        //float horizontalInput = Input.GetAxis("Horizontal");
        //transform.Rotate(Vector3.up, horizontalInput * rotationSpeed * Time.deltaTime);
       Vector3 direction = Vector3.forward * variableJoystick.Vertical + Vector3.right * variableJoystick.Horizontal;
        transform.Rotate(Vector3.up, direction * rotationSpeed * Time.deltaTime);
    }

}

I guess you want

transform.Rotate(Vector3.up * variableJoystick.Horizontal * rotationSpeed * Time.deltaTime);

then, or also maybe easier to read

transform.Rotate(0, variableJoystick.Horizontal * rotationSpeed * Time.deltaTime, 0);