Browser not opening? local host Loading

Dash Python
1

I am an absolute beginner in Dash and plotly. I started doing the tutorials and the browser is not loading and the terminal message is as follows

~/repos/dash  python app.py

  • Serving Flask app “app” (lazy loading)
  • Environment: production
    WARNING: This is a development server. Do not use it in a production deployment.
    Use a production WSGI server instead.
  • Debug mode: on
  • Running on http://127.0.0.1:8050/ (Press CTRL+C to quit)
  • Restarting with stat
  • Debugger is active!
  • Debugger PIN: 142-637-277

I copied the url and pasted in Chrome browser this brings lots of error message in the terminal as follows

127.0.0.1 - - [07/May/2020 14:52:23] “GET / HTTP/1.1” 200 -
127.0.0.1 - - [07/May/2020 14:52:23] “GET /_dash-component-suites/dash_html_components/dash_html_components.min.js?v=1.0.3 HTTP/1.1” 200 -
127.0.0.1 - - [07/May/2020 14:52:23] “GET /_dash-component-suites/dash_renderer/prod?v=1.4.1 HTTP/1.1” 500 -
Traceback (most recent call last):
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 2464, in call
return self.wsgi_app(environ, start_response)
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 2450, in wsgi_app
response = self.handle_exception(e)
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 1867, in handle_exception
reraise(exc_type, exc_value, tb)
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/_compat.py”, line 39, in reraise
raise value
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 2447, in wsgi_app
response = self.full_dispatch_request()
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/_compat.py”, line 39, in reraise
raise value
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 1950, in full_dispatch_request
rv = self.dispatch_request()
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/flask/app.py”, line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File “/Users/sree/anaconda3/envs/dash/lib/python3.7/site-packages/dash/dash.py”, line 396, in serve_component_suites
})[path_in_package_dist.split(’.’)[-1]]
KeyError: ‘prod’
127.0.0.1 - - [07/May/2020 14:52:23] “GET /_dash-component-suites/dash_core_components/async-datepicker.js?v=1.10.0 HTTP/1.1” 200 -
127.0.0.1 - - [07/May/2020 14:52:23] “GET /_dash-component-suites/dash_core_components/async-dropdown.js?v=1.10.0 HTTP/1.1” 200 -
127.0.0.1 - - [07/May/2020 14:52:23] “GET /_dash-component-suites/dash_html_components/dash_html_components.min.js.map?v=1.0.3 HTTP/1.1” 500 -

The browser showing only loading message

I am using mac and python 3.7
dash 1.4.1 py_0

file name : dash-1.4.1-py_0.tar.bz2
name : dash
version : 1.4.1
build : py_0
build number: 0
size : 56 KB
license : MIT
subdir : noarch
url : https://repo.anaconda.com/pkgs/main/noarch/dash-1.4.1-py_0.tar.bz2
md5 : e8f74595ea6ec5c898f3eeb32ec64426
timestamp : 2019-12-17 15:41:36 UTC
dependencies:

  • dash-core-components 1.3.1
  • dash-html-components 1.0.1
  • dash-renderer 1.1.2
  • dash-table 4.4.1
  • flask >=1.0.2
  • flask-compress
  • future
  • plotly
  • python
  • pyyaml >=5.1.1

I have gone through similar topics without any proposed solution.

I will be super grateful if someone can find out the issue here.

Thanks in advance

2

could you try upgrading dash?

1 Like
3

@chriddyp Thanks for your reply.

I solved the issue. After installing the dash-renderer, now it is working. But still the automatic refresh seems not working. Every time after making some change in the code, I have to refresh the browser for see the update. Is that normal?

Thanks for your reply.

Regards