Halfling.Serialization.DeserializeException: Deserialization from source "<C:\Program Files (x86)\Steam\steamapps\common\Cosmoteer\Data\cosmoteer.rules>" failed.
---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> Halfling.Serialization.DeserializeException: Deserialization from source "<C:\Program Files (x86)\Steam\steamapps\common\Cosmoteer\Data\ships\terran\terran.rules>/Terran" failed.
---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> Halfling.Serialization.DeserializeException: Deserialization from source "<C:\Program Files (x86)\Steam\steamapps\common\Cosmoteer\Data\ships\terran\laser_blaster_small\laser_blaster_small.rules>/Part" failed.
---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.ArgumentException: An item with the same key has already been added. Key: NeedsCrewMinusNone

at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
at Cosmoteer.Ships.Parts.PartRules..ctor(ObjectTextSerializer s, IOTNode node, ProgressTracker pt) in C:\Users\walt\Documents\Code\Cosmoteer\Source\Ships\Parts\PartRules.cs:line 431
at InvokeStub_PartRules..ctor(Object, Span`1)
at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
--- End of inner exception stack trace ---