Schema Length Validation Error on Python Dash DataTable - dropdown

Question

I am building a dashboard using python dash and have a requirement of datatable with multiple dropdowns. The dataframe is created one with groupby (multiple columns) and aggregation.
I have written the code as below:
'''
app = JupyterDash()
app.layout = html.Div(children = [html.H2('SPEND PLANNING',
style = {'background-color':'#C0C0C0',
'border': '5px solid',
'font-family':'Serif',
'font-size': 25,
'text-align':'center',
'margin':'auto',
'justify-content': 'space-evenly',
'width':'100%'
}),
html.H1(),
html.Div(children = [dcc.Dropdown(
id ='period-filter',
options = dict([{"label": i, "value": i} for i in s2['PERIOD'].unique()]),
value = s2['PERIOD'].max(),
multi = True,
searchable=True,
style = {'display':'inline-block','width':'48%','vertical-align':'top'},
clearable=False,
placeholder="Quarter"
)]),
html.H1(),
html.Div(children = [dcc.Dropdown(
id ='commodity-filter',
options = dict([{"label": i, "value": i} for i in s2['COMMODITY GROUP'].unique()]),
value = s2['COMMODITY GROUP'].max(),
multi = True,
searchable=True,
style = {'display':'inline-block','width':'48%'},
clearable=False,
placeholder= "Commodity Group"
)]),
html.H1(),
html.Div(children = [dt(
id = "datatable",
columns = [{"name": i, "id": i} for i in s2.columns],
editable = True,
data = s2.to_dict('records'),
multi = True
])
#app.callback(output = [Output("datatable", "data")],
inputs = [Input("period-filter", "value"),Input("commodity-filter","value")])
def display_table(comm,period):
filtered_df = s2.loc[(s2['COMMODITY GROUP'].eq('comm')) & (s2['PERIOD'].eq('period'))]
return filtered_df.to_dict('records')
if _name_ == "_main_":
app.run_server(debug=True)
'''
The error after running the script is below:
SchemaLengthValidationError: Schema: [<Output datatable.data>]
Path: ()
Expected length: 1
Received value of length 0:
[]
When I remove the [] from [Output("datatable", "data")] the error is gone, however the data in the table also disappears giving a blank table.
The dropdowns also do not show the values, instead shows only - value.
Please help me with the above.