unity – Error CS1929: MonoBehaviour doesn’t include a definition of `OfType()`

I am fairly new to C#/Unity. I am getting this error:

CS1929: MonoBehaviour doesn’t include a definition of .OfType<>().

If I perceive proper, Systeme.Linq not acknowledge this operate. What have I achieved fallacious on this code?

DataPersitenceManager.cs

utilizing System.Collections;
utilizing System.Collections.Generic;
utilizing UnityEngine;
utilizing System.Linq;


public class DataPersistenceManager : MonoBehaviour
{

    non-public Checklist<IDataPersistence> findAllDataPersistenceObjects()
    {
        IEnumerable<IDataPersistence> dataPersistenceObjects = FindObjectOfType<MonoBehaviour>().OfType<IDataPersistence>();
        return new Checklist<IDataPersistence>(dataPersistenceObjects);
    }
}

IDataPersistence.cs

utilizing System.Collections;
utilizing System.Collections.Generic;
utilizing UnityEngine;

public interface IDataPersistence
{
    void loadData(gameData knowledge);
    void saveData(ref gameData knowledge);
}

gameData.cs

utilizing System.Collections;
utilizing System.Collections.Generic;
utilizing UnityEngine;

[System.Serializable]
public class gameData
{
}