Python Editor crash

Hi, I’m not sure if this is the same issue, but I am unable to open the Python Editor. When I select

Command: _EditPythonScript

I receive the message:

Error occured loading plug-in
 Details:
Failed to load language 'IronPython 2.7.5': Method not found: 'Boolean Microsoft.Scripting.Utils.ReflectionUtils.IsInterface(System.Type)'.Unknown command: _EditPythonScript

Version: Rhino 6 SR0 2017-6-6 (Rhino WIP, 6.0.17157.8191