ArgumentException: Key duplication(System.Collections.Hashtable)

Unity Engine
1

Hi,

I’m using Unity version 4.3.1f.
For some reason, when I try to extend the Hierarchy of any GameObject
it’ll get me exception as below continuity:

ArgumentException: Key duplication when adding: 1065353216
System.Collections.Hashtable.PutImpl (System.Object key, System.Object value, Boolean overwrite) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System.Collections/Hashtable.cs:831)
System.Collections.Hashtable.Add (System.Object key, System.Object value) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System.Collections/Hashtable.cs:474)
UnityEditor.BaseProjectWindow.SetExpanded (Int32 instanceID, Boolean expand)
UnityEditor.BaseProjectWindow.RevealObjects (System.Int32[ ] targetInstanceIDs)
UnityEditor.BaseProjectWindow.OnSelectionChange ()
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[ ] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[ ] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[ ] parameters) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj)
UnityEditor.HostView.Invoke (System.String methodName)
UnityEditor.HostView.OnSelectionChange ()

I try to reinstall Unity or mono, but still not work.
it’ll very much appreciate if someone could give me some advise or help.

thanks.

2

Does this also happen in empty project? Are you using editor scripts or editor extensions from the asset store?