So I’m stuck trying to create a plot with multiple Sankey diagrams. Specifically, I keep getting an error that says **"Invalid property specified for object of type plotly.graph\_objs.Sankey: 'xaxis'"**. This seems to be invoked when the script gets to the **append\_trace** command. Here is a simple example code, which I run in a Jupyter notebook:

```
import plotly.tools as tools
import plotly.offline as offline
import plotly.graph_objs as go

offline.init_notebook_mode(connected = True)

trace1 = go.Sankey(
    node = dict(
        pad = 15,
        thickness = 20,
        line = dict(
            color = "black",
            width = 0.5
        ),
        label = ["Joe", "Molly", "Gavin", "Octavio", "Leslie", "Natasha"],
        color = ["blue", "red", "green", "yellow", "brown", "magenta"]
    ),
    link = dict(
        source = [0,1,3],
        target = [5,5,0],
        value = [6,8,3]
    )
)

trace2 = go.Sankey(
    node = dict(
        pad = 15,
        thickness = 20,
        line = dict(
            color = "black",
            width = 0.5
        ),
        label = ["Russia", "Gambia", "Sweden", "Bolivia", "Timor-Leste", "Kazakhstan", "Bhutan"],
        color = ["red", "black", "brown", "magenta", "yellow", "blue", "orange"]
    ),
    link = dict(
        source = [0,1,4,6],
        target = [7,7,7,3],
        value = [6,8,3,3]
    )
)

fig = tools.make_subplots(rows = 2, cols = 1)

fig.append_trace(trace1, 1, 1)
fig.append_trace(trace2, 2, 1)

fig['layout'].update(
    title = "Basic Sankey Diagram with Two Subplots",
    font = dict(
      size = 10
    )
)

offline.iplot(fig)

```

When I run it, I get the following traceback:

```
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-4-dd6268edf7ab> in <module>
     37 fig = tools.make_subplots(rows = 2, cols = 1)
     38 
---> 39 fig.append_trace(trace1, 1, 1)
     40 fig.append_trace(trace2, 2, 1)
     41 

/anaconda3/lib/python3.7/site-packages/plotly/basedatatypes.py in append_trace(self, trace, row, col)
   1222 """, DeprecationWarning)
   1223 
-> 1224         self.add_trace(trace=trace, row=row, col=col)
   1225 
   1226     def _set_trace_grid_position(self, trace, row, col):

/anaconda3/lib/python3.7/site-packages/plotly/basedatatypes.py in add_trace(self, trace, row, col)
   1069         return self.add_traces(data=[trace],
   1070                                rows=[row] if row is not None else None,
-> 1071                                cols=[col] if col is not None else None
   1072                                )[0]
   1073 

/anaconda3/lib/python3.7/site-packages/plotly/basedatatypes.py in add_traces(self, data, rows, cols)
   1152         if rows is not None:
   1153             for trace, row, col in zip(data, rows, cols):
-> 1154                 self._set_trace_grid_position(trace, row, col)
   1155 
   1156         # Make deep copy of trace data (Optimize later if needed)

/anaconda3/lib/python3.7/site-packages/plotly/basedatatypes.py in _set_trace_grid_position(self, trace, row, col)
   1259                                 "An axis object for ({r},{c}) subplot "
   1260                                 "cell got deleted.".format(r=row, c=col))
-> 1261             trace['xaxis'] = ref[0]
   1262             trace['yaxis'] = ref[1]
   1263 

/anaconda3/lib/python3.7/site-packages/plotly/basedatatypes.py in __setitem__(self, prop, value)
   2823             # ### Validate prop ###
   2824             if prop not in self._validators:
-> 2825                 self._raise_on_invalid_property_error(prop)
   2826 
   2827             # ### Get validator for this property ###

/anaconda3/lib/python3.7/site-packages/plotly/basedatatypes.py in _raise_on_invalid_property_error(self, *args)
   3006                                  full_obj_name=full_obj_name,
   3007                                  invalid_str=invalid_str,
-> 3008                                  prop_descriptions=self._prop_descriptions))
   3009 
   3010     def update(self, dict1=None, **kwargs):

ValueError: Invalid property specified for object of type plotly.graph_objs.Sankey: 'xaxis'

```

I am NOT specifying **xaxis** in my traces, so where the hell is this coming from? Seems like this part may have something to do with it:

```
/anaconda3/lib/python3.7/site-packages/plotly/basedatatypes.py in _set_trace_grid_position(self, trace, row, col)
   1259                                 "An axis object for ({r},{c}) subplot "
   1260                                 "cell got deleted.".format(r=row, c=col))
-> 1261             trace['xaxis'] = ref[0]
   1262             trace['yaxis'] = ref[1]
   1263

```

Is this a bug? I have no idea.

Somebody help!