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How to return dash editable table into pandas dataframe?

Currently I’m working on basic Progress Tracker in which you enter your tasks, estimated time and time taken" to complete it.
I’m taking total number of tasks from the user and based on that I’m generating total number of rows.
Till here, the app works fine, but when showing the graph, it is not working and I’m not to able to figure out the issue.

import dash
import pandas as pd
import dash_core_components as dcc
import dash_html_components as html
import dash_table_experiments as dt
from dash.dependencies import Input, Output

app = dash.Dash(__name__)
app.scripts.config.serve_locally = True

app.layout = html.Div([
    html.H2('Daily Progress Tracker', style={'textAlign' : 'center'}),
    html.Div([
	    html.Div([
		    html.Div([
			    html.H4('How many Tasks? '),
			    dcc.Input(id='total-tasks', type='text', placeholder='Total Tasks: ', value=3),
		    ], style={'margin-bottom' : 35, 'textAlign' : 'center'}),
		    html.Div(id='daily-table'),
		    html.Div(dt.DataTable(id='table', rows=[{}]), style={'display' : 'none'}),
	    ], className='six columns'),
	    html.Div([
		    dcc.Graph(id='daily-progress')
	    ], className='six columns')
    ], className='row')
])

@app.callback(
    Output('daily-table', 'children'),
    [Input('total-tasks', 'value')]
)
def decide_total_tasks(tasks):
    try:
	    today_tasks = int(tasks)
	    specific_day = {
		    'Tasks' : [None] * today_tasks,
		'    Time Estimated (hrs)' : [None] * today_tasks,
		'    Time Taken (hrs)' : [None] * today_tasks 
	    }
	    specific_day = pd.DataFrame(specific_day)
	    specific_day = specific_day[['Tasks', 'Time Estimated (hrs)', 'Time Taken (hrs)']]

	    return html.Div([
		    dt.DataTable(
			    rows=specific_day.to_dict('records'),
			    columns=specific_day.columns,
			    editable=True
		    )
	    ], style={'textAlign' : 'center'})
    except Exception as e:
	    return html.Div([
		    html.H2('Please provide a number')
	    ], style={'textAlign' : 'center'})


@app.callback(
    Output('daily-progress', 'figure'),
    [Input('table', 'rows')]
)
def track_progress(rows):
    ddf = pd.DataFrame(rows)
    return {
	    'data' : [
		    {'x' : ddf['Tasks'], 'y' : ddf['Time Estimated (hrs)'], 'name' : 'Estimated'},
		    {'x' : ddf['Tasks'], 'y' : ddf['Time Taken (hrs)'], 'name' : 'Taken'}
	    ]
         }

app.css.append_css({
    'external_url' : 'https://codepen.io/chriddyp/pen/bWLwgP.css'
})

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

Please let me know where I’m going wrong