wxgui GRC 3.7.13.5 MacOS 10.14.6

[Carlos]

As I remember wxgui is not in GRC 3.8 but I can’t move to 3.8 yet. I installed 
GRC with Macports but I’m having problems running any wxgui sink. Is there a 
way to get them working? Here’s one of the blocks.

 File 
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/fftsink2.py",
 line 31, in <module>
    from fftsink_gl import fft_sink_f, fft_sink_c
  File 
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/fftsink_gl.py",
 line 27, in <module>
    import fft_window
  File 
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/fft_window.py",
 line 33, in <module>
    import forms
  File 
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/forms/__init__.py",
 line 36, in <module>
    from forms import \
  File 
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/wxgui/forms/forms.py",
 line 64, in <module>
    class _form_base(pubsub, wx.BoxSizer):
TypeError: Error when calling the metaclass bases
    multiple bases have instance lay-out conflict

v/r,

Carlos