# Unable to load app 0 (mountpoint='') (callable not found or import error)

**URL:** https://community.plotly.com/t/unable-to-load-app-0-mountpoint-callable-not-found-or-import-error/48219
**Category:** Dash Python
**Created:** [December 15, 2020, 10:34am UTC](https://community.plotly.com/t/unable-to-load-app-0-mountpoint-callable-not-found-or-import-error/48219 "2020-12-15T10:34:56Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Dmitriy](https://avatars.discourse-cdn.com/v4/letter/d/4bbf92/32.png) [@Dmitriy](https://community.plotly.com/u/Dmitriy)
#### Post date: [December 15, 2020, 10:34am UTC](https://community.plotly.com/t/unable-to-load-app-0-mountpoint-callable-not-found-or-import-error/48219/1 "2020-12-15T10:34:56Z")

</div>

Hi evreone!

I am trying to deploy test Dash app on my server (Ubuntu 20.04 but I am having issues deploying it

I continue to get the error every time.  
I am not an experienced programmer, but I have been playing with dash and plotly lately; I think it is a great tool.  
I really want this to work as I would like my organization to buy some licenses in the future.

I would appreciate any help you can give me.

Below is the code and the error:

**Error:**  
**Dec 15 10:15:13 dimonsdash uwsgi[1310]: unable to load app 0 (mountpoint=‘’) (callable not found or import error)**

## **log server**

```auto
Dec 15 10:15:12 dimonsdash uwsgi[1310]: ***Operational MODE: preforking***
Dec 15 10:15:13 dimonsdash uwsgi[1310]: unable to load app 0 (mountpoint='') (callable not found or import error)
Dec 15 10:15:13 dimonsdash uwsgi[1310]: ***no app loaded. going in full dynamic mode***
Dec 15 10:15:13 dimonsdash uwsgi[1310]: ***uWSGI is running in multiple interpreter mode***

```

## **project.py**

```auto
import dash
import dash_core_components as dcc
import dash_html_components as html
from flask import Flask

external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = dash.Dash( __name__ , external_stylesheets=external_stylesheets)
server = app.server

app.layout = html.Div([
    html.H2('Hello World'),
    dcc.Dropdown(
        id='dropdown',
        options=[{'label': i, 'value': i} for i in ['LA', 'NYC', 'MTL']],
        value='LA'
    ),
    html.Div(id='display-value')
])

@app.callback(dash.dependencies.Output('display-value', 'children'),
              [dash.dependencies.Input('dropdown', 'value')])
def display_value(value):
    return 'You have selected "{}"'.format(value)

```

## **wsgi.py**

```auto
from project import server as application

if __name__ == ' __main__':
    application.run(debug=True, host='0.0.0.0')

```