ObjectPropertyBag Error when building

Hey

I've been trying to build my project and ran into this error, it happens at build time if IL2CPP or at start on Mono

Spoiler: Exception

IL2CPP error for type 'Unity.Properties.CodeGeneratedPropertyBagRegistry.System_ObjectPropertyBag' in assembly 'C:\Projects\ECS test\Temp\StagingArea\Data\Managed\Assembly-CSharp.dll'
Additional information: Invalid method 'System.Void Unity.Properties.PropertyBag`1<System.Object>::Accept(TContainer&,TVisitor&,Unity.Properties.ChangeTracker&)' found in vtable for 'Unity.Properties.CodeGeneratedPropertyBagRegistry.System_ObjectPropertyBag'

I've managed to narrow it down to somewhere in the PropertyBag code generation (what is this for BTW?)
I made a quick edit to exclude objects from the code gen but I just ran into another issue with List's

To reproduce, new project with latest entities packages, paste the following code and try to make a IL2CPP build

Code (CSharp):

1. public class Test
2. {
3.    // public List<object> stringObjectTest;
4.     public object obj;
5. }
6.  
7. public class TestContainer : IComponentData , IEquatable<TestContainer>
8. {
9.     public Test TestClass;
10.  
11.     public bool Equals(TestContainer other)
12.     {
13.         if (ReferenceEquals(null, other)) return false;
14.         if (ReferenceEquals(this, other)) return true;
15.         return Equals(TestClass, other.TestClass);
16.     }
17.  
18.     public override bool Equals(object obj)
19.     {
20.         if (ReferenceEquals(null, obj)) return false;
21.         if (ReferenceEquals(this, obj)) return true;
22.         if (obj.GetType() != this.GetType()) return false;
23.         return Equals((TestContainer) obj);
24.     }
25.  
26.     public override int GetHashCode()
27.     {
28.         return (TestClass != null ? TestClass.GetHashCode() : 0);
29.     }
30. }
31.  

(IEquatable was autogenerated via Rider)

Unfortunately I can't work around this by not have any objects within my ComponentData's as im using class IComponentData's to wrap/interface with 3rd party code and they are using a object field for something

Also the exception made 0 sense to help narrow this down

 

Bump

Can someone from Unity confirm if this is a bug and if I should create a bug report or if this is a intentional error/limitation with a bad error message?

 

Awesome, thanks for the detailed response

I'm not using subscenes yet, instead I make heavy use of the IConvertGameObjectToEntity flow and then after the prefab is converted I attach a bunch more Components depending on data I've loaded. One of those components is a wrapper around a asset store package type (Vectrosity) which contains a object field/property somewhere.

Your suggestion makes sense, I'll replace the IComponentData Vectrosity field with a ID and store them in a list somewhere that my systems can access

Thanks again for your help

 

The bug is not be fixed in Entities 0.7.0-preview.19.Will it be fixed in next version?