# Dash App Deploy Error H10

**URL:** <https://community.plotly.com/t/dash-app-deploy-error-h10/50202>\
**Category:** Dash Python\
**Created:** [February 19, 2021, 4:00am UTC](https://community.plotly.com/t/dash-app-deploy-error-h10/50202 "2021-02-19T04:00:50Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![sangjunyoon](https://avatars.discourse-cdn.com/v4/letter/s/439d5e/32.png) [@sangjunyoon](https://community.plotly.com/u/sangjunyoon)\
**Post date:** [February 19, 2021, 4:00am UTC](https://community.plotly.com/t/dash-app-deploy-error-h10/50202/1 "2021-02-19T04:00:50Z")

</div>

**app2.py**

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

import pandas as pd

external\_stylesheets = [‘/chriddyp/pen/bWLwgP.css’]

app2 = dash.Dash( **name** , external\_stylesheets=external\_stylesheets)

server = app2.server

df = pd.read\_csv(‘://plotly.github.io/datasets/country\_indicators.csv’)

available\_indicators = df[‘Indicator Name’].unique()

app2.layout = html.Div([

```
html.Div([

    html.Div([

        dcc.Dropdown(

            id='xaxis-column',

            options=[{'label': i, 'value': i} for i in available_indicators],

            value='Fertility rate, total (births per woman)'

        ),

        dcc.RadioItems(

            id='xaxis-type',

            options=[{'label': i, 'value': i} for i in ['Linear', 'Log']],

            value='Linear',

            labelStyle={'display': 'inline-block'}

        )

    ],

    style={'width': '48%', 'display': 'inline-block'}),

    html.Div([

        dcc.Dropdown(

            id='yaxis-column',

            options=[{'label': i, 'value': i} for i in available_indicators],

            value='Life expectancy at birth, total (years)'

        ),

        dcc.RadioItems(

            id='yaxis-type',

            options=[{'label': i, 'value': i} for i in ['Linear', 'Log']],

            value='Linear',

            labelStyle={'display': 'inline-block'}

        )

    ],style={'width': '48%', 'float': 'right', 'display': 'inline-block'})

]),

dcc.Graph(id='indicator-graphic'),

dcc.Slider(

    id='year--slider',

    min=df['Year'].min(),

    max=df['Year'].max(),

    value=df['Year'].max(),

    marks={str(year): str(year) for year in df['Year'].unique()},

    step=None

)

```

])

@app2.callback(

```
Output('indicator-graphic', 'figure'),

Input('xaxis-column', 'value'),

Input('yaxis-column', 'value'),

Input('xaxis-type', 'value'),

Input('yaxis-type', 'value'),

Input('year--slider', 'value'))

```

def update\_graph(xaxis\_column\_name, yaxis\_column\_name,

```
             xaxis_type, yaxis_type,

             year_value):

dff = df[df['Year'] == year_value]

fig = px.scatter(x=dff[dff['Indicator Name'] == xaxis_column_name]['Value'],

                 y=dff[dff['Indicator Name'] == yaxis_column_name]['Value'],

                 hover_name=dff[dff['Indicator Name'] == yaxis_column_name]['Country Name'])

fig.update_layout(margin={'l': 40, 'b': 40, 't': 10, 'r': 0}, hovermode='closest')

fig.update_xaxes(title=xaxis_column_name,

                 type='linear' if xaxis_type == 'Linear' else 'log')

fig.update_yaxes(title=yaxis_column_name,

                 type='linear' if yaxis_type == 'Linear' else 'log')

return fig

```

#if **name** == ‘ **main** ’:

# app2.run\_server(debug=True, port=8080)

**.gitignore**  
venv

\*.pyc

.env

.DS\_Store

**Procfile**  
web: gunicorn app2:server

**requirements.txt**  
appdirs==1.4.4

Brotli==1.0.9

click==7.1.2

cycler==0.10.0

dash==1.19.0

dash-core-components==1.15.0

dash-extensions==0.0.45

dash-html-components==1.1.2

dash-renderer==1.9.0

dash-table==4.11.2

distlib==0.3.1

filelock==3.0.12

Flask==1.1.2

Flask-Caching==1.9.0

Flask-Compress==1.8.0

future==0.18.2

itsdangerous==1.1.0

Jinja2==2.11.3

kiwisolver==1.3.1

MarkupSafe==1.1.1

matplotlib==3.3.4

more-itertools==8.7.0

numpy==1.18.1

pandas==1.1.5

Pillow==8.1.0

plotly==4.14.3

pyparsing==2.4.7

python-dateutil==2.8.1

pytz==2021.1

retrying==1.3.3

six==1.15.0

source==1.2.0

virtualenv==20.4.2

Werkzeug==1.0.1

I am deploying a dash app example to Heroku, but I am keep getting H10 error.  
I checked Procfile, and others. They seem correct.  
The dash app itself works fine when I run it on a local server.

Please, help me solve this problem.

(venv) C:\Users\16124\Desktop\dash\_app\_example\dash-app2-example\>heroku logs  
2021-02-19T03:24:10.444865+00:00 app[web.1]: File “”, line 678, in exec\_module  
2021-02-19T03:24:10.444865+00:00 app[web.1]: File “”, line 219, in \_call\_with\_frames\_removed  
2021-02-19T03:24:10.444866+00:00 app[web.1]: File “/app/app2.py”, line 5, in   
2021-02-19T03:24:10.444866+00:00 app[web.1]: import plotly.express as px  
2021-02-19T03:24:10.444867+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/plotly/express/ **init**.py”, line 12, in   
2021-02-19T03:24:10.444867+00:00 app[web.1]: Plotly express requires pandas to be installed.“”"  
2021-02-19T03:24:10.444925+00:00 app[web.1]: ImportError: Plotly express requires pandas to be installed.  
2021-02-19T03:24:10.445210+00:00 app[web.1]: [2021-02-19 03:24:10 +0000] [10] [ERROR] Exception in worker process  
2021-02-19T03:24:10.445211+00:00 app[web.1]: Traceback (most recent call last):  
2021-02-19T03:24:10.445211+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 583, in spawn\_worker  
2021-02-19T03:24:10.445212+00:00 app[web.1]: worker.init\_process()  
2021-02-19T03:24:10.445212+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py”, line 119, in init\_process  
2021-02-19T03:24:10.445212+00:00 app[web.1]: self.load\_wsgi()  
2021-02-19T03:24:10.445213+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py”, line 144, in load\_wsgi  
2021-02-19T03:24:10.445213+00:00 app[web.1]: self.wsgi = self.app.wsgi()  
2021-02-19T03:24:10.445213+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/base.py”, line 67, in wsgi  
2021-02-19T03:24:10.445214+00:00 app[web.1]: self.callable = self.load()  
2021-02-19T03:24:10.445220+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py”, line 49, in load  
2021-02-19T03:24:10.445220+00:00 app[web.1]: return self.load\_wsgiapp()  
2021-02-19T03:24:10.445220+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py”, line 39, in load\_wsgiapp  
2021-02-19T03:24:10.445221+00:00 app[web.1]: return util.import\_app(self.app\_uri)  
2021-02-19T03:24:10.445221+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/util.py”, line 358, in import\_app  
2021-02-19T03:24:10.445222+00:00 app[web.1]: mod = importlib.import\_module(module)  
2021-02-19T03:24:10.445222+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/importlib/ **init**.py”, line 126, in import\_module  
2021-02-19T03:24:10.445224+00:00 app[web.1]: return \_bootstrap.\_gcd\_import(name[level:], package, level)  
2021-02-19T03:24:10.445224+00:00 app[web.1]: File “”, line 994, in \_gcd\_import  
2021-02-19T03:24:10.445224+00:00 app[web.1]: File “”, line 971, in \_find\_and\_load  
2021-02-19T03:24:10.445225+00:00 app[web.1]: File “”, line 955, in \_find\_and\_load\_unlocked  
2021-02-19T03:24:10.445225+00:00 app[web.1]: File “”, line 665, in \_load\_unlocked  
2021-02-19T03:24:10.445226+00:00 app[web.1]: File “”, line 678, in exec\_module  
2021-02-19T03:24:10.445226+00:00 app[web.1]: File “”, line 219, in \_call\_with\_frames\_removed  
2021-02-19T03:24:10.445226+00:00 app[web.1]: File “/app/app2.py”, line 5, in   
2021-02-19T03:24:10.445227+00:00 app[web.1]: import plotly.express as px  
2021-02-19T03:24:10.445227+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/plotly/express/ **init**.py”, line 12, in   
2021-02-19T03:24:10.445227+00:00 app[web.1]: Plotly express requires pandas to be installed.“”"  
2021-02-19T03:24:10.445274+00:00 app[web.1]: ImportError: Plotly express requires pandas to be installed.  
2021-02-19T03:24:10.445544+00:00 app[web.1]: [2021-02-19 03:24:10 +0000] [9] [INFO] Worker exiting (pid: 9)  
2021-02-19T03:24:10.445940+00:00 app[web.1]: [2021-02-19 03:24:10 +0000] [10] [INFO] Worker exiting (pid: 10)  
2021-02-19T03:24:10.599626+00:00 app[web.1]: Traceback (most recent call last):  
2021-02-19T03:24:10.599676+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 209, in run  
2021-02-19T03:24:10.600138+00:00 app[web.1]: self.sleep()  
2021-02-19T03:24:10.600176+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 357, in sleep  
2021-02-19T03:24:10.600531+00:00 app[web.1]: ready = select.select([self.PIPE[0]], , , 1.0)  
2021-02-19T03:24:10.600568+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 242, in handle\_chld  
2021-02-19T03:24:10.600849+00:00 app[web.1]: self.reap\_workers()  
2021-02-19T03:24:10.600891+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 525, in reap\_workers  
2021-02-19T03:24:10.601307+00:00 app[web.1]: raise HaltServer(reason, self.WORKER\_BOOT\_ERROR)  
2021-02-19T03:24:10.601375+00:00 app[web.1]: gunicorn.errors.HaltServer: \<HaltServer ‘Worker failed to boot.’ 3\>  
2021-02-19T03:24:10.601411+00:00 app[web.1]:  
2021-02-19T03:24:10.601412+00:00 app[web.1]: During handling of the above exception, another exception occurred:  
2021-02-19T03:24:10.601412+00:00 app[web.1]:  
2021-02-19T03:24:10.601445+00:00 app[web.1]: Traceback (most recent call last):  
2021-02-19T03:24:10.601477+00:00 app[web.1]: File “/app/.heroku/python/bin/gunicorn”, line 8, in   
2021-02-19T03:24:10.601663+00:00 app[web.1]: sys.exit(run())  
2021-02-19T03:24:10.601696+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py”, line 58, in run  
2021-02-19T03:24:10.601889+00:00 app[web.1]: WSGIApplication(“%(prog)s [OPTIONS] [APP\_MODULE]”).run()  
2021-02-19T03:24:10.601923+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/base.py”, line 228, in run  
2021-02-19T03:24:10.602193+00:00 app[web.1]: super().run()  
2021-02-19T03:24:10.602226+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/base.py”, line 72, in run  
2021-02-19T03:24:10.602421+00:00 app[web.1]: Arbiter(self).run()  
2021-02-19T03:24:10.602454+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 229, in run  
2021-02-19T03:24:10.602748+00:00 app[web.1]: self.halt(reason=inst.reason, exit\_status=inst.exit\_status)  
2021-02-19T03:24:10.602754+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 342, in halt  
2021-02-19T03:24:10.603089+00:00 app[web.1]: self.stop()  
2021-02-19T03:24:10.603133+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 390, in stop  
2021-02-19T03:24:10.603499+00:00 app[web.1]: self.kill\_workers(sig)  
2021-02-19T03:24:10.603503+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 626, in kill\_workers  
2021-02-19T03:24:10.603969+00:00 app[web.1]: self.kill\_worker(pid, sig)  
2021-02-19T03:24:10.603974+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 636, in kill\_worker  
2021-02-19T03:24:10.604438+00:00 app[web.1]: os.kill(pid, sig)  
2021-02-19T03:24:10.604472+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 242, in handle\_chld  
2021-02-19T03:24:10.604740+00:00 app[web.1]: self.reap\_workers()  
2021-02-19T03:24:10.604773+00:00 app[web.1]: File “/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py”, line 525, in reap\_workers  
2021-02-19T03:24:10.605145+00:00 app[web.1]: raise HaltServer(reason, self.WORKER\_BOOT\_ERROR)  
2021-02-19T03:24:10.605180+00:00 app[web.1]: gunicorn.errors.HaltServer: \<HaltServer ‘Worker failed to boot.’ 3\>  
2021-02-19T03:24:10.683527+00:00 heroku[web.1]: Process exited with status 1  
2021-02-19T03:24:10.772430+00:00 heroku[web.1]: State changed from up to crashed  
2021-02-19T03:24:16.130499+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path=“/favicon.ico” host=dash-app2-example.herokuapp request\_id=93b96341-6a7e-4fae-8cd0-1d6c21475082 fwd=“44.192.106.53” dyno=web.1 connect=2ms service= status=503 bytes= protocol=https  
2021-02-19T03:32:59.000000+00:00 app[api]: Build started by user @gmail.com  
2021-02-19T03:33:31.000000+00:00 app[api]: Build failed – check your build output: //dashboard…heroku/apps/cf293ff7-48ea-4a69-9ea5-f1139175d9d0/activity/builds/6304bd73-f811-428d-bab4-0fc76acb25e0  
2021-02-19T03:38:18.000000+00:00 app[api]: Build started by user @gmail.com  
2021-02-19T03:38:58.000000+00:00 app[api]: Build failed – check your build output: dashboard…heroku.com/apps/cf293ff7-48ea-4a69-9ea5-f1139175d9d0/activity/builds/29982769-10b3-45ed-a537-e5e384b58fee  
2021-02-19T03:39:33.000000+00:00 app[api]: Build started by user @gmail.com  
2021-02-19T03:40:08.000000+00:00 app[api]: Build failed – check your build output: dashboard…heroku.com/apps/cf293ff7-48ea-4a69-9ea5-f1139175d9d0/activity/builds/bf6a9ce4-475e-4aa8-adba-2c901015006b  
2021-02-19T03:41:58.000000+00:00 app[api]: Build started by user @gmail.com  
2021-02-19T03:43:50.124948+00:00 app[api]: Deploy f4d8c4c7 by user @gmail.com  
2021-02-19T03:43:50.124948+00:00 app[api]: Release v4 created by user @gmail.com  
2021-02-19T03:43:50.307746+00:00 heroku[web.1]: State changed from crashed to starting  
2021-02-19T03:44:08.440224+00:00 heroku[web.1]: Starting process with command `gunicorn app2:server`  
2021-02-19T03:44:11.237649+00:00 app[web.1]: bash: gunicorn: command not found  
2021-02-19T03:44:11.291497+00:00 heroku[web.1]: Process exited with status 127  
2021-02-19T03:44:11.406755+00:00 heroku[web.1]: State changed from starting to crashed  
2021-02-19T03:44:11.410720+00:00 heroku[web.1]: State changed from crashed to starting  
2021-02-19T03:44:14.000000+00:00 app[api]: Build succeeded  
2021-02-19T03:44:25.471022+00:00 heroku[web.1]: Starting process with command `gunicorn app2:server`  
2021-02-19T03:44:27.540370+00:00 app[web.1]: bash: gunicorn: command not found  
2021-02-19T03:44:27.584170+00:00 heroku[web.1]: Process exited with status 127  
2021-02-19T03:44:27.669781+00:00 heroku[web.1]: State changed from starting to crashed  
2021-02-19T03:44:28.885145+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path=“/” [host=dash-app2-example.herokuapp.com](http://host=dash-app2-example.herokuapp.com) request\_id=05d36120-95a3-4004-9c5f-6b25cb1cb809 fwd=“44.192.106.53” dyno= connect= service= status=503 bytes= protocol=https  
2021-02-19T03:44:29.035315+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path=“/favicon.ico” [host=dash-app2-example.herokuapp.com](http://host=dash-app2-example.herokuapp.com) request\_id=d2faf993-fd10-418f-bf6f-dc0334dc7129 fwd=“44.192.106.53” dyno= connect= service= status=503 bytes= protocol=https

(venv) C:\Users\16124\Desktop\dash\_app\_example\dash-app2-example\>heroku run printenv  
Running printenv on ⬢ dash-app2-example… up, run.8027 (Free)  
PYTHONUNBUFFERED=true  
PYTHONHASHSEED=random  
PWD=/app  
PORT=53715  
GUNICORN\_CMD\_ARGS=–access-logfile -  
LINES=67  
DYNO\_RAM=512  
HOME=/app  
LANG=en\_US.UTF-8  
COLUMNS=294  
FORWARDED\_ALLOW\_IPS=\*  
PYTHONPATH=/app  
PYTHONHOME=/app/.heroku/python  
LIBRARY\_PATH=/app/.heroku/vendor/lib:/app/.heroku/python/lib:  
SHLVL=0  
WEB\_CONCURRENCY=2  
LD\_LIBRARY\_PATH=/app/.heroku/vendor/lib:/app/.heroku/python/lib:  
PS1=[\033[01;34m]\w[\033[00m] [\033[01;32m]$ [\033[00m]  
PATH=/app/.heroku/python/bin:/usr/local/bin:/usr/bin:/bin  
DYNO=run.8027  
\_=/usr/bin/printenv