unity data_error ai_generated partial

SerializationWarning: ScriptableObject 'PlayerData' has version mismatch. Expected version 1, found version 2. Data may be lost.

ID: unity/scriptableobject-serialization-version-mismatch

Also available as: JSON · Markdown · 中文

78%Fix Rate

85%Confidence

1Evidence

2023-10-05First Seen

Version Compatibility

Version	Status	Introduced	Deprecated	Notes
Unity 2021.3.0f1	active	—	—	—
Unity 2022.3.0f1	active	—	—	—
Unity 2023.2.0f1	active	—	—	—
Unity 2024.1.0b1	active	—	—	—

Root Cause

A ScriptableObject asset was serialized with a newer version of its class definition (e.g., added fields), but the current code expects an older version, causing deserialization mismatches.

generic

中文

ScriptableObject 资源使用较新版本的类定义（例如添加了字段）序列化，但当前代码期望旧版本，导致反序列化不匹配。

Official Documentation

https://docs.unity3d.com/ScriptReference/Serialization.html

Workarounds

80% success Implement custom serialization with versioning: Add a version field to the ScriptableObject and use OnBeforeSerialize/OnAfterDeserialize to handle migration. Example: public int version = 1; public void OnAfterDeserialize() { if (version < 2) { // migrate old data version = 2; } }
```
Implement custom serialization with versioning: Add a version field to the ScriptableObject and use OnBeforeSerialize/OnAfterDeserialize to handle migration. Example:
public int version = 1;
public void OnAfterDeserialize() {
    if (version < 2) {
        // migrate old data
        version = 2;
    }
}
```
75% success Use a custom Editor script to update all ScriptableObject assets to the latest version: Iterate through assets and call a migration method that sets default values for new fields.
```
Use a custom Editor script to update all ScriptableObject assets to the latest version: Iterate through assets and call a migration method that sets default values for new fields.
```

中文步骤

Implement custom serialization with versioning: Add a version field to the ScriptableObject and use OnBeforeSerialize/OnAfterDeserialize to handle migration. Example:
public int version = 1;
public void OnAfterDeserialize() {
    if (version < 2) {
        // migrate old data
        version = 2;
    }
}

Use a custom Editor script to update all ScriptableObject assets to the latest version: Iterate through assets and call a migration method that sets default values for new fields.

Dead Ends

Common approaches that don't work:

Delete and recreate the ScriptableObject asset from scratch 90% fail
This loses all existing data and may not be feasible if data is critical; also does not fix the root mismatch.
Revert the script to the old version without the new fields 75% fail
This prevents using new features and may break other parts of the code that depend on the new fields.