'ValueError: Cannot accept list of column references or list of columns for both `x` and `y`

I am not able to get the heatmap in Plotly and getting ValueError: Cannot accept list of column references

def update_graph(xaxis_column_name, yaxis_column_name,value):
dff = df[df['Year'] == value]   

fig = px.density_heatmap(
                          
                          x=dff[dff['Population'] == xaxis_column_name]['Pop. Density (per sq. mi.)'],
                          y=dff[dff['Area (sq. mi.)'] == yaxis_column_name]['Pop. Density (per sq. mi.)'],
                          text_auto=True,
                          hover_name=dff[dff['Country'] == yaxis_column_name]['Region'])
return fig

plotly-dash

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'ValueError: Cannot accept list of column references or list of columns for both `x` and `y`

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