Plotly-Dash error

Hi Guys,

I'm getting an error while executing the code...Please help me if anyone is aware of dash and plotly.

Thanks in advance.

#code:

getting error as.. Callback error updating the graph.figure

import pandas as pd

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output
import plotly.express as px

df = pd.read_csv("C:/Users/ganjali001/Documents/DEMO_NEW.csv")

app = dash.Dash(__name__)

#---------------------------------------------------------------
app.layout = html.Div([
    html.Div([
        html.Label(['Payment Details']),
        dcc.Dropdown(
            id='my_dropdown',
            options=[
                     {'label': 'Commercial', 'value': 'COMMERCIAL'},
                     {'label': 'Medicare', 'value': 'MEDICARE'},
                     {'label': 'Medicaid', 'value': 'MEDICAID'},
                     {'label': 'Self Pay', 'value': 'SELF-PAY'},
                     {'label': 'Default', 'value': 'DEFAULT'}
            ],
            value='SELF-PAY',
            multi=False,
            clearable=False,
            style={"width": "50%"}
        ),
    ]),

    html.Div([
        dcc.Graph(id='the_graph')
    ]),

])

#---------------------------------------------------------------
@app.callback(
    Output(component_id='the_graph', component_property='figure'),
    [Input(component_id='my_dropdown', component_property='value')]
)

def update_graph(my_dropdown):
    dff = df

    piechart = px.pie(
        data_frame=dff,
        values='PaymentAmt',
        names=my_dropdown,
        color='FinancialClass',  # differentiate markers (discrete) by color
        
        title='Payments by Financial Class',  # figure title
        template='presentation',  # 'ggplot2', 'seaborn', 'simple_white', 'plotly',
        
        width=800,  # figure width in pixels
        height=600,  # figure height in pixels
        hole=0,  # represents the hole in middle of pie
    )

    return (piechart)


if __name__ == '__main__':
    app.run_server(debug=True, port=1200)

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