Resolved Try using subscene in Android player but failed

I created a project to do some tests about subscene (using Universal RP). I wrote a custom bootstrap to create a world for loading subscene and later DefaultGameObjectInjectionWorld move the entites from it. Everything goes fine in editor but it doesn't work in android player. I found the exception by adb.

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2.   at Unity.Entities.TypeManager.GetSystems (Unity.Entities.WorldSystemFilterFlags filterFlags, Unity.Entities.WorldSystemFilterFlags requiredFlags) [0x0002a] in <4689184a8a0f453797aecd147541936e>:0
3.   at Unity.Entities.DefaultWorldInitialization.GetAllSystems (Unity.Entities.WorldSystemFilterFlags filterFlags, System.Boolean requireExecuteAlways) [0x00001] in <4689184a8a0f453797aecd147541936e>:0
4.   at CustomBootstrap.Initialize (System.String defaultWorldName) [0x00001] in E:\Projects\SubsceneTest5\Assets\Scripts\CustomBootstrap.cs:29
5.   at Unity.Entities.DefaultWorldInitialization.Initialize (System.String defaultWorldName, System.Boolean editorWorld) [0x00019] in <4689184a8a0f453797aecd147541936e>:0
6.   at Unity.Entities.AutomaticWorldBootstrap.Initialize () [0x00001] in E:\Projects\SubsceneTest5\Library\PackageCache\com.unity.entities@0.16.0-preview.21\Unity.Entities.Hybrid\Injection\AutomaticWorldBootstrap.cs:15

The exception is occurred when try to get the list of all default systems.

Code (CSharp):

1. public class CustomBootstrap : ICustomBootstrap
2. {
3.      ...
4.  
5.     public bool Initialize(string defaultWorldName)
6.     {
7.        // Exception is the line below
8.         var systems = DefaultWorldInitialization.GetAllSystems(WorldSystemFilterFlags.Default);
9.      }
10.       ...
11. }
12.  

I used BuildConfiguration, the config is here.


Unity 2020.1.4.f1
Entities 0.16.0-preview.21
Hybrid Render 0.10.0-preview.21
Platforms Android 0.9.0-preview.9
Universal RP 9.0.0-preview.72

Does anyone know why this is happening?

​

 

Finally, i found the way to fix it. Before calling DefaultWorldInitialization, should initialize
DefaultGameObjectInjectionWorld first.