System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.ValueCollection.Enumerator.MoveNext()
at Server.Mobiles.EffectsSystem.RegionEffectsCheck(PlayerMobile from)
at Server.Mobiles.EffectsSystem.EffectsCheck(PlayerMobile from)
at Server.Timer.Slice() in c:\ServUO\Server\Timer.cs:line 410
at Server.Core.Main(String[] args) in c:\ServUO\Server\Main.cs:line 577
 
"Collection was modified", pretty much sounds like collection concurrency, basically, writing datas on a collection that something else is reading, which conflicts.
 
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