If anyone knows the title of the mod that displays this error, I'd appreciate it if you could let me know.

[comsasa]

I'm not good at English, so please understand that I'm writing in translation.

If anyone knows the title of the mod that displays this error, I'd appreciate it if you could let me know.

After the 1.2.5F1 update, the following errors continue to appear.
If anyone knows what mode the notification for this error is in, please reply.

==================================================================
[ERROR] Collection was modified; enumeration operation may not execute.

InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.HashSet`1+Enumerator[T].MoveNext () [0x00013] in <c03468d2fee641abba39a2eec40e96b6>:0
at Colossal.IO.AssetDatabase.AssetDatabase+<GetAssets>d__89`1[T].MoveNext () [0x00137] in <83ab2467216c4a94834dc2201631b170>:0
at Colossal.IO.AssetDatabase.AssetDatabase.<SaveSettings>b__92_0 () [0x000d9] in <83ab2467216c4a94834dc2201631b170>:0
at Colossal.IO.AssetDatabase.AssetDatabase.<SaveSettings>b__92_0 () [0x001a5] in <83ab2467216c4a94834dc2201631b170>:0
at Colossal.TaskManager+TaskQueue.RunNextTask (System.String name) [0x000b5] in <0563fbdd09a94ad8a503082b1bc79703>:0
Colossal.Logging.CustomLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:LogFormat(LogType, String, Object[])
Colossal.Logging.UnityLogger:Log(Level, String, Exception)
Colossal.Logging.UnityLogger:Error(Exception)
Colossal.<RunNextTask>d__11:MoveNext()
System.Runtime.CompilerServices.MoveNextRunner:InvokeMoveNext(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Runtime.CompilerServices.MoveNextRunner:Run()
System.Threading.Tasks.AwaitTaskContinuation:InvokeAction(Object)
System.Threading.Tasks.AwaitTaskContinuation:RunCallback(ContextCallback, Object, Task&)
System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation:Run(Task, Boolean)
System.Threading.Tasks.Task:FinishContinuations()
System.Threading.Tasks.Task:FinishStageThree()
System.Threading.Tasks.Task:FinishStageTwo()
System.Threading.Tasks.Task:Finish(Boolean)
System.Threading.Tasks.Task:TrySetException(Object)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:SetException(Exception)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder:SetException(Exception)
Colossal.IO.AssetDatabase.<<SaveSettings>b__92_0>d:MoveNext()
System.Runtime.CompilerServices.MoveNextRunner:InvokeMoveNext(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Runtime.CompilerServices.MoveNextRunner:Run()
System.Threading.Tasks.AwaitTaskContinuation:InvokeAction(Object)
System.Threading.Tasks.AwaitTaskContinuation:RunCallback(ContextCallback, Object, Task&)
System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation:Run(Task, Boolean)
System.Threading.Tasks.Task:FinishContinuations()
System.Threading.Tasks.Task:FinishStageThree()
System.Threading.Tasks.Task`1:TrySetResult(VoidTaskResult)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:SetResult(VoidTaskResult)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1:SetResult(Task`1)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder:SetResult()
System.Runtime.CompilerServices.AsyncValueTaskMethodBuilder:SetResult()
Colossal.IO.AssetDatabase.Internal.<DisposeAsync>d__5:MoveNext()
System.Runtime.CompilerServices.MoveNextRunner:InvokeMoveNext(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Runtime.CompilerServices.MoveNextRunner:Run()
System.Threading.Tasks.<>c:<.cctor>b__7_0(Object)
UnityEngine.WorkRequest:Invoke()
UnityEngine.UnitySynchronizationContext:Exec()
UnityEngine.UnitySynchronizationContext:ExecuteTasks()
==================================================================

 

[antrachton]

I had to remove extra assets importer and all associated mods pretending to be assets. If we want to have assets we have to wait for the asset editor to come out.
The error then hasn't appeared again.