Unity Issue Tracker - ArgumentException is thrown when trying to create a Prefab out of a imported model asset using PrefabUtility.SaveAsPrefabAsset()

By Design

Votes

0

Found in

2018.3.0a6

2018.3.0f2

2019.1.0a1

2019.2.0a1

Issue ID

1114273

Regression

No

ArgumentException is thrown when trying to create a Prefab out of a imported model asset using PrefabUtility.SaveAsPrefabAsset()

Scene Management

-

Jan 03, 2019

Reproduction steps:
1. Open the project from "CreatePrefabFromModelBug.zip"
2. Right click on the "Model" asset inside Project window and click -> Reimport

Expected: New prefab is created from the reimported model
Actual: "ArgumentException: Can't save persistent object as a Prefab asset" is thrown and logged in the console

Reproduces on: 2018.3.6f1, 2019.1.0b3, 2019.2.0a5

Note:
PrefabUtility.SaveAsPrefabAsset was introduced in 2018.3.0a6

Resolution Note:

The creation of the prefab out of the model in postprocessor requires a little bit more code: You need to instantiate your model first, then save as prefab asset and destroy the instance.

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Comments (2)

Airmouse

Mar 23, 2019 06:00

Turns out it was because I was trying to save the .fbx directly as a prefab. Instead I needed to first instantiate it, then I could save it:

var SceneObject = Instantiate(modelAsset);
PrefabUtility.SaveAsPrefabAsset (SceneObject, destinationPath);
DestroyImmediate (SceneObject);
Airmouse

Mar 23, 2019 05:40

Same in 2019, break Unity automation and is makeing gamebuilding a time consuming nightmare.

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