WebGL Build with Entities/ECS not working (Burst related too maybe)

Unity 2019.3.0f5
I have a scene with some GameObjects with ConvertToEntity. Basic stuff, some cubes and some spheres. The spheres have unity dots physics on them, and they just fall down on a plane at startup. This works fine in a windows build through scriptable build pipeline.

However when I do a classic build using the scriptable build pipeline, webgl target and run it in Chrome, I get the bellow error. Any ideas?

Tried both Entities 0.4.0 and 0.5.0, same error, see below please. How do I fix this?

Code (CSharp):

1. e4c48cb5-1327-488d-af3c-2c9990260db4:3436 NotSupportedException: To marshal a managed method, please add an attribute named 'MonoPInvokeCallback' to the method definition. The method we're attempting to marshal is: Unity.Entities.StructuralChange::AddComponentEntitiesBatchExecute
2.  at System.Runtime.InteropServices.Marshal.GetFunctionPointerForDelegateInternal (System.Delegate d) [0x00000] in <00000000000000000000000000000000>:0
3.  at System.Runtime.InteropServices.Marshal.GetFunctionPointerForDelegate (System.Delegate d) [0x00000] in <00000000000000000000000000000000>:0
4.  at Unity.Burst.BurstCompiler.Compile[T] (T delegateObj, System.Boolean isFunctionPointer) [0x00000] in <00000000000000000000000000000000>:0
5.  at Unity.Burst.BurstCompiler.CompileFunctionPointer[T] (T delegateMethod) [0x00000] in <00000000000000000000000000000000>:0
6.  at Unity.Entities.StructuralChange.Initialize () [0x00000] in <00000000000000000000000000000000>:0
7.  at Unity.Entities.EntityManager..ctor (Unity.Entities.World world) [0x00000] in <00000000000000000000000000000000>:0
8.  at Unity.Entities.World..ctor (System.String name) [0x00000] in <00000000000000000000000000000000>:0
9.  at Unity.Entities.DefaultWorldInitialization.Initialize (System.String defaultWorldName, System.Boolean editorWorld) [0x00000] in <00000000000000000000000000000000>:0
10.  at Unity.Entities.AutomaticWorldBootstrap.Initialize () [0x00000] in <00000000000000000000000000000000>:0
11. (Filename: currently not available on il2cpp Line: -1)
12.  
13.  

My build settings:



Packages in project:

 

Having the same issue. It works fine in the Editor, but crashes with the error message above in WebGL.

 

As far as I know webgl with ecs just isn't supported yet, theres been a couple threads about it. You could use Project Tiny instead since it's being developed from the ground up with web/mobile in mind.

 

Had the same issue. Ended up downgrading the Entities package to 0.3.0 to avoid this exception. There are still other issues preventing it from working though (getting "memory access out of bounds,RuntimeError" all over the place).

 

Hi Sebastian, what is the current state of DOTS + WebGL.
Cheers

 

I am also wondering. Is there many code differences between ECS normal and tiny? Most my systems are using ScheduleParallel, so if its the same code I could convert my project, in order to hit WebGL too.

 

Any ETAs on when Entities package will be working with WebGL? In fact it hasn't been updated in an entire year..!