I want to read CSV regularly and update the value calculated by pandas

I want to read CSV regularly and update the value calculated by pandas, but it doesn’t update well. Help me.

import os
import json
import dash
import dash_core_components as dcc
import dash_html_components as html
import plotly.express as px
import plotly.graph_objs as go
import dash_table
import numpy as np
import pandas as pd
from datetime import datetime
from dash.dependencies import Input, Output, State
from dash import Dash, callback_context, no_update
import datetime as dt
import time

import dash_bootstrap_components as dbc



external_stylesheets = ["https://codepen.io/ogawahideyuki/pen/LYVzaae.css"]
app = dash.Dash(
    __name__,
    external_stylesheets=external_stylesheets,
    meta_tags=[
        {"name": "viewport", "content": "width=device-width, initial-scale=1.0"}
    ],
)
app.config.suppress_callback_exceptions = True
cfg = dict()


appdata_csv = dt.datetime.now()
appDataPath = appdata_csv.strftime('%Y_%m_%d')
appDataPath
cfg['app_data_dir'] = appDataPath

# READ DATA
# ============================================
# データを読み込む
# ============================================
today_csv = pd.read_csv('src/2021_03_19.csv',
                        index_col=0,
                        parse_dates=True
                        )

app.layout = html.Div([
    html.Div(
        [
            html.H2(
                f"工程可視化ダッシュボード",
                style={"display": "inline-block", "marginRight": 40},
            ),
                html.P(
                "最終更新日",
                style={"display": "inline-block"},
                className="update_date",
                ),
                html.A(html.Button("分析", className='three columns'),
                href="http://127.0.0.1:8050/hands-on-02", target="_blank",
                style={"margin-left": "3%"},
                # style={"display": "block"},
                ),
        ],
        style={"width": "100%", "backgroundColor": "#000000", "borderRadius": 10,
                "padding": "1%", "vertical-align": "middle"},
    ),

    dcc.Interval(id="interval", interval=10000),
    dcc.Graph(id="output"),
    dcc.Markdown(
        """
        データ元 :  
        """
    ),
    html.A(
        "生産技術データベース",
        href="\\192.168.4.84",
        target="_blank",
        # style={"display": "inline-block"},
    ),
])
@app.callback(Output("output", "figure"), [Input("interval", "n_intervals")])
def display_time(n):
    today_csv = pd.read_csv('src/2021_03_19.csv',
                        index_col=0,
                        parse_dates=True
                        )
    today_1hour = today_csv.sort_values(['data', 'date'])
    today_1hour12 =today_1hour.query(' location in (1, 2)').copy()
    today_1hour12["diff_time"] = today_1hour12.index.to_series().diff().map(lambda x: x.total_seconds())
    today_1hour12 = today_1hour12.query('location == 2')
    today_1hour12 = today_1hour12[(today_1hour12['diff_time'] < 200.0) & (today_1hour12['diff_time'] > 0)]
    today_1hour12.reset_index(drop=False, inplace=True)
    tidy_2_1hours = today_1hour12[today_1hour12['date'] > dt.datetime.now()- dt.timedelta(minutes=1000)]
    tidy_2_1hours = tidy_2_1hours.replace({'location': {2: '員数管理'}})
    tidy_2_1hours_n = tidy_2_1hours["diff_time"].count()
    fig=go.Box(
            x= tidy_2_1hours["location"],
            y=tidy_2_1hours["diff_time"],
            name="員数管理"+ f"(n={tidy_2_1hours_n})",
            jitter=0.8,
            pointpos=-0.8,
            text=tidy_2_1hours["date"],
            boxpoints='all', # represent all points
            marker_color='rgba(93, 164, 214, 0.5)',
            line_color='rgba(93, 164, 214, 0.5)'
        )
    return fig
    
if __name__ == "__main__":
    app.run_server(debug=True)

(This error originated from the built-in JavaScript code that runs Dash apps. Click to see the full stack trace or open your browser’s console.)
Error: Failed component prop type: Invalid component prop figure key boxpoints supplied to Graph.

Bad object: {

“boxpoints”: “all”,

“jitter”: 0.8,

“name”: “員数管理(n=0)”,

“pointpos”: -0.8,

“text”: ,

“x”: ,

“y”: ,

“type”: “box”,

“marker”: {

"color": "rgba(93, 164, 214, 0.5)"

},

“line”: {

"color": "rgba(93, 164, 214, 0.5)"

}

}

Valid keys: [

“data”,

“layout”,

“frames”

]

at propTypeErrorHandler (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/dash_renderer.v1_9_0m1611094913.dev.js:98515:9)

at CheckedComponent (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/dash_renderer.v1_9_0m1611094913.dev.js:92763:77)

at renderWithHooks (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:14938:20)

at updateFunctionComponent (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:17169:22)

at beginWork (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:18745:18)

at HTMLUnknownElement.callCallback (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:182:16)

at Object.invokeGuardedCallbackDev (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:231:18)

at invokeGuardedCallback (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:286:33)

at beginWork$1 (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:23338:9)

at performUnitOfWork (http://127.0.0.1:8050/_dash-component-suites/dash_renderer/react-dom@16.v1_9_0m1611094913.14.0.js:22292:14)

Not able to replicate your issue since the 2021_03_19.csv file is missing from my local setup. Can you provide a link to the CSV file so I can troubleshoot?