Backends could be imported

[agallenne]

I would like to try the VIP package, but I come across various issues using the tutorial. I have the version 0.9.11, and use it in ipython. The issue I am facing now is that none of the backend could be imported. See error message:

In [9]: betapic.plot()
WARNING:param.notebook_extension: Holoviews matplotlib extension could not be imported, it raised the following exception: PermissionError('[Errno 13] Permission denied: 'convert'')

ImportError Traceback (most recent call last)
in
----> 1 betapic.plot()

~/opt/anaconda3/lib/python3.7/site-packages/vip_hci/hci_dataset.py in plot(self, **kwargs)
911 HCIplot.
912 """
--> 913 hp.plot_cubes(self.cube, **kwargs)
914
915 def recenter(self, method='2dfit', xy=None, subi_size=5, model='gauss',

~/opt/anaconda3/lib/python3.7/site-packages/hciplot/hciplot.py in plot_cubes(cube, mode, backend, dpi, figtype, vmin, vmax, size, width, height, cmap, colorbar, dynamic, anim_path, data_step_range, label, label_step_range, delay, anim_format, delete_anim_cache, **kwargs)
665 http://holoviews.org/user_guide/Applying_Customizations.html
666 """
--> 667 hv.extension(backend)
668
669 if not isinstance(cube, np.ndarray):

~/opt/anaconda3/lib/python3.7/site-packages/param/parameterized.py in new(class_, *args, **params)
2810 inst = class_.instance()
2811 inst.param.set_name(class.name)
-> 2812 return inst.call(*args,**params)
2813
2814 def call(self,*args,**kw):

~/opt/anaconda3/lib/python3.7/site-packages/holoviews/ipython/init.py in call(self, *args, **params)
114
115 def call(self, *args, **params):
--> 116 super(notebook_extension, self).call(*args, **params)
117 # Abort if IPython not found
118 try:

~/opt/anaconda3/lib/python3.7/site-packages/holoviews/util/init.py in call(self, *args, **params)
708
709 if selected_backend is None:
--> 710 raise ImportError('None of the backends could be imported')
711 Store.set_current_backend(selected_backend)
712

ImportError: None of the backends could be imported