InvalidOperationException: The NativeArray has been deallocated, it is not allowed to access it

Unity Engine
,
1

Not sure what I am doing wrong here, I am attempting to change the mesh that my MeshRenderer Component is using, it will work for a few frames then my console gets spammed with the above error.

line that is causing the error
mesh = entityManager.GetSharedComponentData(m_Data.animator*.entity);*
full script
```
*public struct Data
{
public int Length;
public ComponentDataArray animator;
[ReadOnly] public SharedComponentDataArray renderer;

}
[Inject] private Data m_Data;

protected override void OnUpdate()
{
for(int i = 0; i < m_Data.Length; i++)
{
mesh = entityManager.GetSharedComponentData(m_Data.animator[i].entity);
mesh.mesh = idleMesh[CurrentFrame];
entityManager.SetSharedComponentData(m_Data.animator[i].entity, mesh);
}
currentFrame = (currentFrame >=100) ? 0 : currentFrame = currentFrame += 1;
}*
* *here is how I am spawning the entity* *

  •    actors = new NativeArray<Entity>(100, Allocator.Persistent);
  Entity[] characters = new Entity[actors.Length];
  var entityManager = World.Active.GetOrCreateManager<EntityManager>();
  var protoType = entityManager.Instantiate(umaPrefab);
  entityManager.AddComponentData(protoType, new Position { Value = new float3(0, 0, 0) });
  entityManager.AddComponentData(protoType, new Rotation { Value = new quaternion(-90, 0, 180, 0) });
  entityManager.AddComponentData(protoType, new TransformMatrix());
  entityManager.AddComponentData(protoType, new AnimatorComponent { });
  renderer = umaPrefab.transform.Find("UMARenderer").GetComponent<SkinnedMeshRenderer>();
  entityManager.AddSharedComponentData(protoType, new MeshRenderComponent { mesh = renderer.sharedMesh, material = renderer.sharedMaterial});

  entityManager.Instantiate(protoType, actors);
  entityManager.DestroyEntity(protoType);
  actors.CopyTo(characters);

  for (int i = 0; i < characters.Length; ++i)
  {
      entityManager.SetComponentData(characters[i], new Position { Value = new float3(1 * i, 0, 1 * (i/10)) });
      entityManager.SetComponentData(characters[i], new Rotation { Value = new quaternion(0, 0, 0, 0) });
      entityManager.SetComponentData(characters[i], new AnimatorComponent { entity = characters[i] });
    
            
  }
    void OnDestroy()
    {
    actors.Dispose();
    }*
    ```
2

When you change entities via the entitiymanager directly, it invalidates the entity array, this causes the error.

Is your first script is a ComponentSystem? If yes, try to using PostUpdateCommands instead of entityManager. Also try to inject your mesh into Data if possible. GetSharedComponentData isn’t very fast.

3

If you use the MeshInstanceSystem.cs inside the Entity Component package as an guide they store a cached array of SharedComponents (MeshInstanceRenderer). You could do this to get the shared component then pass it into the job. I think the method is EntityManger.GetAllUniqueSharedComponentData()

4

This worked thank you very much for pointing me in the right direction.

5

I am having the same issue, but not sure how to create an entity from within MonoBehaviour within OnWillRenderObject method without an EntityManager

6

Same issue as Kender… Is there a way to create entities in MonoBehaviours post update?

7

I do not think there is a way by default, you could try adding a static method to that entities system then call it from monobehavior.

8 
World.Active.GetOrCreateManager<EntityManager>().CreateEntity(...)
9

That will invalidate the entity array. He needs to create them via post update commands.

10

that matters only if you are inside a system.
he said MonoBehaviour, that’s outside ECS so there is nothing to invalidate.

if you are already inside a system, you just use PostUpdateCommands (or a barrier system if you are in a JobComponentSystem)

11

Hello, so i had a similar problem. I changed the SetSharedComponent to PostUpdateCommands, but not instead of having errors, the components don’t seem to update. I’m trying to set textures via MeshInstanceRenderer.