Error trying to import random in python(Rhino 6 WIP)

The script was working fine in Rhino 5. But when I open it in Rhino 6 WIP, it gives the following error message:

Runtime error (MissingMethodException): Method not found: 'Void Microsoft.Scripting.Utils.ExceptionUtils.RemoveData(System.Exception, System.Object)'.

Traceback:
line 67, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\types.py"
line 6, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\abc.py"
line 11, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\_abcoll.py"
line 83, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\UserDict.py"
line 398, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\os.py"
line 9, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\linecache.py"
line 6, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\warnings.py"
line 43, in <module>, "C:\Program Files\Rhino WIP\Plug-ins\IronPython\Lib\random.py"
line 5, in script