[Part 12] SerializationException

[Sidinei Rocha Vianna]

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SerializationException: Type 'UnityEngine.MonoBehaviour' in Assembly 'UnityEngine.CoreModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable.

when I go to sleep the game crashes.

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using UnityEngine;

public class SaveManager : MonoBehaviour
{
    static readonly string FILEPATH = Application.persistentDataPath + "/Save.save";

    public static void Save(GameSaveState save)
    {
        //Save as JSON
        //string json = JsonUtility.ToJson(save);
        //File.WriteAllText(FILEPATH, json);

        //Save as binary file
        using (FileStream file = File.Create(FILEPATH))
        {
            new BinaryFormatter().Serialize(file, save);
            Debug.Log("SaveManager(save) funcionando");
        }
    }



    public static GameSaveState Load()
    {
        GameSaveState loadedSave = null;
        //JSON
        /*
        if (File.Exists(FILEPATH))
        {
            string json = File.ReadAlltext(FILEPATH);
            loadedSave = JsonUtility.FromJson<GameSaveState>(json);
        }*/

        //Bynary method
        //Check if the file exist
        if (File.Exists(FILEPATH))
        {
            Debug.Log("O file Save existe");
            //Open it up and deserialize
            using (FileStream file = File.Open(FILEPATH, FileMode.Open))
            {
                object loadedData = new BinaryFormatter().Deserialize(file);
                //cast the deserialized object as a GameSaveState
                loadedSave = (GameSaveState)loadedData;
            }
        }
        return loadedSave;
    }


}

[Tarha Apustaja]

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The reference information suggests that to resolve the SerializationException, you need to mark your classes with [System.Serializable] attribute. Specifically, all classes involved in saving (GameSaveState, LandSaveState, CropSaveState, etc.) must be marked with [System.Serializable] to be compatible with BinaryFormatter serialization.

[Terence]

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Just to add on to what Tarha said, you mark it like this:

[System.Serializable]
public class GameSaveState {
    ...
}

You need to mark all the classes that Tarha mentions.

@Tarha can you provide a list of all the classes in the project we need to mark as [System.Serializable]?

[Tarha Apustaja]

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The error occurs because not all classes involved in serialization are marked with [System.Serializable]. You need to add the [System.Serializable] attribute to all classes that will be serialized, including:

• GameSaveState
• LandSaveState
• CropSaveState
• ItemSlotSaveData
• GameTimestamp

Example:

[System.Serializable]
public class GameSaveState {
    // existing code
}

This will resolve the SerializationException by marking the classes as serializable for binary serialization.

[Sidinei Rocha Vianna]

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I check all the files, and all the classes are [System.Serializable].

GameSaveState – ok LandSaveState – ok CropSaveState – ok ItemSlotSaveData – ok GameTimestamp – ok

[Tarha Apustaja]

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The reference information confirms that all the mentioned classes should indeed be marked with [System.Serializable], so your observation is correct. This attribute allows these classes to be serialized and saved/loaded in Unity’s save system.

[Terence]

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@sidineirochavianna the classes should not inherit from MonoBehaviour, i.e.:

[System.Serializable]
public class GameSaveState : MonoBehaviour {
    // existing code
}

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