Bug couldn't be found in the SystemRegistry. (This is likely a bug in an ILPostprocessor.)

I suddenly got this error after making a new ISystem. It's nothing special. It just adds a cleanup component to entities in its query that doesn't have that cleanup component yet.

ArgumentException: Type Assets.Code.ECS.Systems.AddCleanupComponentSystem couldn't be found in the SystemRegistry. (This is likely a bug in an ILPostprocessor.)
Unity.Entities.WorldUnmanagedImpl.CreateUnmanagedSystemInternal (Unity.Entities.World self, System.Int32 structSize, System.Int64 typeHash, System.Int32 typeIndex, System.Void*& systemPtr, System.Boolean callOnCreate) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/WorldUnmanaged.cs:469)
Unity.Entities.WorldUnmanagedImpl.CreateUnmanagedSystem (Unity.Entities.SystemTypeIndex t, System.Int64 typeHash, System.Boolean callOnCreate) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/WorldUnmanaged.cs:596)
Unity.Entities.WorldUnmanagedImpl.CreateUnmanagedSystem (Unity.Entities.SystemTypeIndex t, System.Boolean callOnCreate) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/WorldUnmanaged.cs:677)
Unity.Entities.WorldUnmanaged.CreateUnmanagedSystem (Unity.Entities.SystemTypeIndex unmanagedType, System.Boolean callOnCreate) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/WorldUnmanaged.cs:1109)
Unity.Entities.World.GetOrCreateSystemsAndLogException (Unity.Collections.NativeList`1[T] types, System.Int32 typesCount, Unity.Collections.AllocatorManager+AllocatorHandle allocator) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/World.cs:1256)
UnityEngine.Debug:LogException(Exception)
Unity.Debug:LogException(Exception) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/Stubs/Unity/Debug.cs:19)
Unity.Entities.World:GetOrCreateSystemsAndLogException(NativeList`1, Int32, AllocatorHandle) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/World.cs:1288)
Unity.Entities.World:GetOrCreateSystemsAndLogException(NativeList`1, AllocatorHandle) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/World.cs:1348)
Unity.Entities.DefaultWorldInitialization:AddSystemToRootLevelSystemGroupsInternal(World, NativeList`1, ComponentSystemGroup, DefaultRootGroups) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/DefaultWorldInitialization.cs:261)
Unity.Entities.DefaultWorldInitialization:AddSystemToRootLevelSystemGroupsInternal(World, NativeList`1) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/DefaultWorldInitialization.cs:300)
Unity.Entities.DefaultWorldInitialization:Initialize(String, Boolean) (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities/DefaultWorldInitialization.cs:153)
Unity.Entities.AutomaticWorldBootstrap:Initialize() (at ./Library/PackageCache/com.unity.entities@1.0.11/Unity.Entities.Hybrid/Injection/AutomaticWorldBootstrap.cs:16)

Why is this happening and what's the workaround?

 

It's not a generic system. The fix was to turn it into a class extending from SystemBase. I don't have the struct version anymore but turning this back to an ISystem is not hard:

Code (CSharp):

1. public partial class AddVisualEffectCleanupSystem : SystemBase
2. {
3.     private EndSimulationEntityCommandBufferSystem _commandBufferSystem;
4.  
5.     private EntityQuery _query;
6.    
7.     protected override void OnCreate()
8.     {
9.         _commandBufferSystem = World.GetOrCreateSystemManaged<EndSimulationEntityCommandBufferSystem>();
10.  
11.         _query = new EntityQueryBuilder(Allocator.Temp)
12.             .WithAll<VisualEffectMarker>()
13.             .WithNone<VisualEffectCleanup>().Build(this);
14.     }
15.  
16.     protected override void OnUpdate()
17.     {
18.         AddCleanupComponentJob addCleanupComponentJob = new()
19.         {
20.             EntityType = GetEntityTypeHandle(),
21.             MarkerType = GetComponentTypeHandle<VisualEffectMarker>(),
22.             CommandBuffer = _commandBufferSystem.CreateCommandBuffer().AsParallelWriter()
23.         };
24.         Dependency = addCleanupComponentJob.ScheduleParallel(_query, Dependency);
25.  
26.         _commandBufferSystem.AddJobHandleForProducer(Dependency);
27.     }
28.  
29.     [BurstCompile]
30.     private struct AddCleanupComponentJob : IJobChunk
31.     {
32.         [ReadOnly]
33.         public EntityTypeHandle EntityType;
34.  
35.         [ReadOnly]
36.         public ComponentTypeHandle<VisualEffectMarker> MarkerType;
37.  
38.         public EntityCommandBuffer.ParallelWriter CommandBuffer;
39.  
40.         public void Execute(in ArchetypeChunk chunk, int unfilteredChunkIndex, bool useEnabledMask, in v128 chunkEnabledMask)
41.         {
42.             NativeArray<Entity> entities = chunk.GetNativeArray(EntityType);
43.             NativeArray<VisualEffectMarker> markers = chunk.GetNativeArray(ref MarkerType);
44.  
45.             ChunkEntityEnumerator enumerator = new(useEnabledMask, chunkEnabledMask, chunk.Count);
46.             while (enumerator.NextEntityIndex(out int i))
47.             {
48.                 Entity entity = entities[i];
49.                 VisualEffectMarker marker = markers[i];
50.  
51.                 CommandBuffer.AddComponent(unfilteredChunkIndex, entity, new VisualEffectCleanup(marker.Id));
52.             }
53.         }
54.     }
55. }

 

Sorry for the late reply. The system has been renamed. The old struct system looked like this as far as I can remember:

Code (CSharp):

1. public partial struct AddCleanupComponentSystem : ISystem
2. {
3.     private EntityQuery _query;
4.  
5.     [BurstCompile]
6.     public void OnCreate(ref SystemState state)
7.     {
8.         _query = new EntityQueryBuilder(Allocator.Temp)
9.             .WithAll<VisualEffectMarker>()
10.             .WithAll<GuidComponentData>()
11.             .WithNone<VisualEffectCleanup>().Build(ref state);
12.     }
13.  
14.     public void OnDestroy(ref SystemState state)
15.     {
16.     }
17.  
18.     [BurstCompile]
19.     public void OnUpdate(ref SystemState state)
20.     {
21.         EndSimulationEntityCommandBufferSystem.Singleton commandBufferSystem =
22.             SystemAPI.GetSingleton<EndSimulationEntityCommandBufferSystem.Singleton>();
23.  
24.         AddCleanupComponentJob addCleanupComponentJob = new()
25.         {
26.             EntityType = state.GetEntityTypeHandle(),
27.             GuidType = state.GetComponentTypeHandle<GuidComponentData>(),
28.             CommandBuffer = commandBufferSystem.CreateCommandBuffer(state.WorldUnmanaged).AsParallelWriter()
29.         };
30.         state.Dependency = addCleanupComponentJob.ScheduleParallel(_query, state.Dependency);
31.     }
32.  
33.     [BurstCompile]
34.     private struct AddCleanupComponentJob : IJobChunk
35.     {
36.         [ReadOnly]
37.         public EntityTypeHandle EntityType;
38.  
39.         [ReadOnly]
40.         public ComponentTypeHandle<GuidComponentData> GuidType;
41.  
42.         public EntityCommandBuffer.ParallelWriter CommandBuffer;
43.  
44.         public void Execute(in ArchetypeChunk chunk, int unfilteredChunkIndex, bool useEnabledMask, in v128 chunkEnabledMask)
45.         {
46.             NativeArray<Entity> entities = chunk.GetNativeArray(EntityType);
47.             NativeArray<GuidComponentData> guids = chunk.GetNativeArray(ref GuidType);
48.  
49.             ChunkEntityEnumerator enumerator = new(useEnabledMask, chunkEnabledMask, chunk.Count);
50.             while (enumerator.NextEntityIndex(out int i))
51.             {
52.                 Entity entity = entities[i];
53.                 GuidComponentData guid = guids[i];
54.  
55.                 CommandBuffer.AddComponent(unfilteredChunkIndex, entity, new VisualEffectCleanup(guid.hashCode));
56.             }
57.         }
58.     }
59. }