[IronPython] Trying to set field to bool, get "TypeError: Argument cannot be null."

[Count László de Almásy]

I need some help understanding what I'm doing wrong here.
Settings.ALWAYS_DECODE_OBJECTS is set in C# like the following:

public bool ALWAYS_DECODE_OBJECTS = true;

But trying to set it to "True" in IPy blows up with the following traceback:

IronPython 2.0 (2.0.0.0) on .NET 2.0.50727.1433
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>>> import clr
>>> clr.AddReference("OpenMetaverse.dll")
>>> clr.AddReference("OpenMetaverseTypes.dll")
>>> from OpenMetaverse import *
>>>
>>> Settings.ALWAYS_DECODE_OBJECTS = True
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "Microsoft.Scripting.Core", line unknown, in Convert
  File "Microsoft.Scripting.Core", line unknown, in Convert
  File "Microsoft.Scripting.Core", line unknown, in RequiresCanRead
TypeError: Argument cannot be null.
Parameter name: expression
>>>

-- 
Cheers, László