import holoviews as hv
hv.extension('matplotlib')

hv.Labels([("hello", 12, "text")])


# This is particularly problematic for this use case
hv.Bars([('hello', 10), ('world', 20)]) * hv.Labels([("hello", 12, "text")])

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
~/venv-3.9/lib/python3.9/site-packages/matplotlib/axis.py in convert_units(self, x)
   1499         try:
-> 1500             ret = self.converter.convert(x, self.units, self)
   1501         except Exception as e:

~/venv-3.9/lib/python3.9/site-packages/matplotlib/category.py in convert(value, unit, axis)
     48         if unit is None:
---> 49             raise ValueError(
     50                 'Missing category information for StrCategoryConverter; '

ValueError: Missing category information for StrCategoryConverter; this might be caused by unintendedly mixing categorical and numeric data

The above exception was the direct cause of the following exception:

ConversionError                           Traceback (most recent call last)
~/venv-3.9/lib/python3.9/site-packages/IPython/core/formatters.py in __call__(self, obj, include, exclude)
    968 
    969             if method is not None:
--> 970                 return method(include=include, exclude=exclude)
    971             return None
    972         else:

~/venv-3.9/lib/python3.9/site-packages/holoviews/core/dimension.py in _repr_mimebundle_(self, include, exclude)
   1315         combined and returned.
   1316         """
-> 1317         return Store.render(self)
   1318 
   1319 

~/venv-3.9/lib/python3.9/site-packages/holoviews/core/options.py in render(cls, obj)
   1403         data, metadata = {}, {}
   1404         for hook in hooks:
-> 1405             ret = hook(obj)
   1406             if ret is None:
   1407                 continue

~/venv-3.9/lib/python3.9/site-packages/holoviews/ipython/display_hooks.py in pprint_display(obj)
    280     if not ip.display_formatter.formatters['text/plain'].pprint:
    281         return None
--> 282     return display(obj, raw_output=True)
    283 
    284 

~/venv-3.9/lib/python3.9/site-packages/holoviews/ipython/display_hooks.py in display(obj, raw_output, **kwargs)
    250     elif isinstance(obj, (CompositeOverlay, ViewableElement)):
    251         with option_state(obj):
--> 252             output = element_display(obj)
    253     elif isinstance(obj, (Layout, NdLayout, AdjointLayout)):
    254         with option_state(obj):

~/venv-3.9/lib/python3.9/site-packages/holoviews/ipython/display_hooks.py in wrapped(element)
    144         try:
    145             max_frames = OutputSettings.options['max_frames']
--> 146             mimebundle = fn(element, max_frames=max_frames)
    147             if mimebundle is None:
    148                 return {}, {}

~/venv-3.9/lib/python3.9/site-packages/holoviews/ipython/display_hooks.py in element_display(element, max_frames)
    190         return None
    191 
--> 192     return render(element)
    193 
    194 

~/venv-3.9/lib/python3.9/site-packages/holoviews/ipython/display_hooks.py in render(obj, **kwargs)
     66         renderer = renderer.instance(fig='png')
     67 
---> 68     return renderer.components(obj, **kwargs)
     69 
     70 

~/venv-3.9/lib/python3.9/site-packages/holoviews/plotting/renderer.py in components(self, obj, fmt, comm, **kwargs)
    448             return data, {}
    449         else:
--> 450             html = self._figure_data(plot, fmt, as_script=True, **kwargs)
    451         data['text/html'] = html
    452 

~/venv-3.9/lib/python3.9/site-packages/holoviews/plotting/mpl/renderer.py in _figure_data(self, plot, fmt, bbox_inches, as_script, **kwargs)
    173                 pass
    174             bytes_io = BytesIO()
--> 175             fig.canvas.print_figure(bytes_io, **kw)
    176             data = bytes_io.getvalue()
    177 

~/venv-3.9/lib/python3.9/site-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, pad_inches, bbox_extra_artists, backend, **kwargs)
   2228                        else suppress())
   2229                 with ctx:
-> 2230                     self.figure.draw(renderer)
   2231 
   2232             if bbox_inches:

~/venv-3.9/lib/python3.9/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     72     @wraps(draw)
     73     def draw_wrapper(artist, renderer, *args, **kwargs):
---> 74         result = draw(artist, renderer, *args, **kwargs)
     75         if renderer._rasterizing:
     76             renderer.stop_rasterizing()

~/venv-3.9/lib/python3.9/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     49                 renderer.start_filter()
     50 
---> 51             return draw(artist, renderer, *args, **kwargs)
     52         finally:
     53             if artist.get_agg_filter() is not None:

~/venv-3.9/lib/python3.9/site-packages/matplotlib/figure.py in draw(self, renderer)
   2778 
   2779             self.patch.draw(renderer)
-> 2780             mimage._draw_list_compositing_images(
   2781                 renderer, self, artists, self.suppressComposite)
   2782 

~/venv-3.9/lib/python3.9/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
    130     if not_composite or not has_images:
    131         for a in artists:
--> 132             a.draw(renderer)
    133     else:
    134         # Composite any adjacent images together

~/venv-3.9/lib/python3.9/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     49                 renderer.start_filter()
     50 
---> 51             return draw(artist, renderer, *args, **kwargs)
     52         finally:
     53             if artist.get_agg_filter() is not None:

~/venv-3.9/lib/python3.9/site-packages/matplotlib/_api/deprecation.py in wrapper(*inner_args, **inner_kwargs)
    429                          else deprecation_addendum,
    430                 **kwargs)
--> 431         return func(*inner_args, **inner_kwargs)
    432 
    433     return wrapper

~/venv-3.9/lib/python3.9/site-packages/matplotlib/axes/_base.py in draw(self, renderer, inframe)
   2919             renderer.stop_rasterizing()
   2920 
-> 2921         mimage._draw_list_compositing_images(renderer, self, artists)
   2922 
   2923         renderer.close_group('axes')

~/venv-3.9/lib/python3.9/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
    130     if not_composite or not has_images:
    131         for a in artists:
--> 132             a.draw(renderer)
    133     else:
    134         # Composite any adjacent images together

~/venv-3.9/lib/python3.9/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     49                 renderer.start_filter()
     50 
---> 51             return draw(artist, renderer, *args, **kwargs)
     52         finally:
     53             if artist.get_agg_filter() is not None:

~/venv-3.9/lib/python3.9/site-packages/matplotlib/text.py in draw(self, renderer)
    677 
    678         with _wrap_text(self) as textobj:
--> 679             bbox, info, descent = textobj._get_layout(renderer)
    680             trans = textobj.get_transform()
    681 

~/venv-3.9/lib/python3.9/site-packages/matplotlib/text.py in _get_layout(self, renderer)
    291         of a rotated text when necessary.
    292         """
--> 293         key = self.get_prop_tup(renderer=renderer)
    294         if key in self._cached:
    295             return self._cached[key]

~/venv-3.9/lib/python3.9/site-packages/matplotlib/text.py in get_prop_tup(self, renderer)
    840         need to know if the text has changed.
    841         """
--> 842         x, y = self.get_unitless_position()
    843         renderer = renderer or self._renderer
    844         return (x, y, self.get_text(), self._color,

~/venv-3.9/lib/python3.9/site-packages/matplotlib/text.py in get_unitless_position(self)
    822         # This will get the position with all unit information stripped away.
    823         # This is here for convenience since it is done in several locations.
--> 824         x = float(self.convert_xunits(self._x))
    825         y = float(self.convert_yunits(self._y))
    826         return x, y

~/venv-3.9/lib/python3.9/site-packages/matplotlib/artist.py in convert_xunits(self, x)
    201         if ax is None or ax.xaxis is None:
    202             return x
--> 203         return ax.xaxis.convert_units(x)
    204 
    205     def convert_yunits(self, y):

~/venv-3.9/lib/python3.9/site-packages/matplotlib/axis.py in convert_units(self, x)
   1500             ret = self.converter.convert(x, self.units, self)
   1501         except Exception as e:
-> 1502             raise munits.ConversionError('Failed to convert value(s) to axis '
   1503                                          f'units: {x!r}') from e
   1504         return ret

ConversionError: Failed to convert value(s) to axis units: 'hello'

import holoviews as hv
hv.extension('bokeh')

hv.Bars([('hello', 10), ('world', 20)]) * hv.Labels([("hello", 12, "text")])