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By Design

By Design in 2023.2.X

Votes

0

Found in

2020.3.3f1

2023.2.0a1

Issue ID

UUM-1302

Regression

No

"script ... is missing!" error in player when PlayableDirector used in AssetBundle, but not player (code stripping)

Asset Bundles

-

Reproduction steps:

  1. Open the attached project from Google Drive (Ritter.zip)
  2. Open the custom build UI (Build menu)
  3. Make sure IL2CPP forced and Full Asset Bundles selected
  4. Press Build -> Build And Run
  5. Open the player logs

!Repro.png!

Expected result: Player Build runs without errors
Actual result: Errors in player.log: The referenced script (Unknown) on this Behaviour is missing!
The referenced script on this Behaviour (Game Object '<null>') is missing!

Note: the project is built using IL2CPP (This error isn't present in the mono version of the project)

Reproducible with: Timeline 1.4.8 (2020.3.32f1), 1.5.2 (2020.3.32f1), 1.7.1 (2020.3.32f1)

Could not test with: 2019.4.37: Custom packages errors - The type or namespace name 'ScriptedImporter' could not be found (are you missing a using directive or an assembly reference?) etc.
2021.2.17f1: Custom packages errors: multiple scripts console errors: error CS0518: Predefined type 'System.Index' is not defined or imported, error CS0656: Missing compiler required member 'System.Index..ctor'
2022.1.0b13, 2022.2.0a8: RenderTarget already allocated error (Custom package error)

  1. Resolution Note:

    The cause of the "missing" errors was because of IL2CPP code stripping, which cannot be disabled in 2020.3. It was removing classes that were only referenced from the AssetBundles in the project, not by the player build itself.

    The way to fix this problem is to specify the path to the .manifest file of the manifest assetbundle. e.g. adding this code prior to calling BuildPlayer()

    buildOptions.assetBundleManifestPath = AssetBundlesBuildPath + "/" + AssetBundlesBuildPath + ".manifest";

    There is some documentation for this file and its use with stripping in https://docs.unity3d.com/2023.1/Documentation/Manual/AssetBundles-Building.html

    We plan to improve some build warnings in this area to help make it easier to debug in this area.

  2. Resolution Note (2023.2.X):

    The cause of the "missing" errors was because of IL2CPP code stripping, which cannot be disabled in 2020.3. It was removing classes that were only referenced from the AssetBundles in the project, not by the player build itself.

    The way to fix this problem is to specify the path to the .manifest file of the manifest assetbundle. e.g. adding this code prior to calling BuildPlayer()

    buildOptions.assetBundleManifestPath = AssetBundlesBuildPath + "/" + AssetBundlesBuildPath + ".manifest";

    There is some documentation for this file and its use with stripping in https://docs.unity3d.com/2023.1/Documentation/Manual/AssetBundles-Building.html

    We plan to improve some build warnings in this area to help make it easier to debug in this area.

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