When executing the following code ``` import plotly.figure_factory as ff fig2 = ff.create_gantt(df_total_gantt, colors=['#FF0000', '#0000FF'], index_col='Complete', show_colorbar=True, bar_width=0.2, showgrid_x=True, showgrid_y=True) fig2.show() ``` it is executed correctly and returns a nice plot, however, it also returns the following: > /usr/local/lib/python3.6/dist-packages/plotly/figure_factory/_gantt.py:49: FutureWarning: > > > .ix is deprecated. Please use > .loc for label based indexing or > .iloc for positional indexing > > See the documentation here: > http://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#ix-indexer-is-deprecated