pm20202 opened a new issue #18943:
URL: https://github.com/apache/superset/issues/18943


   A clear and concise description of what the bug is.
   I am trying to install Superset for building custom visualization using the 
guide at:
   https://superset.apache.org/docs/contributing/creating-viz-plugins
   Please note that I am attempting it on Ubuntu 20.04 VMs behind a proxy. And 
I am running superset on http://localhost:9000/(in dev mode)
   After following all the steps successfully when I run it on 9000 port i am 
able to see Hello World chart but when I am trying to use this chart on dataset 
it shows me this error:
   
   **DB engine Error
   No module named 'superset.common.query_context_factory'
   This may be triggered by:
   Issue 1011 - Superset encountered an unexpected error.**
   
   #### How to reproduce the bug
   
   1. Go to '...'
   2. Click on '....'
   3. Scroll down to '....'
   4. See error
   
   ### Expected results
   
   Hello World chart working on datasets.
   
   ### Actual results
   
   After able to see Hello World plugin chart when trying to use this chart on 
dataset showing this error.
   DB engine Error
   No module named 'superset.common.query_context_factory'
   This may be triggered by:
   Issue 1011 - Superset encountered an unexpected error.
   
   #### Screenshots
   
   If applicable, add screenshots to help explain your problem.
   
   
   ### Environment
   
   (please complete the following information):
   
   OS: Ubuntu Server 20.04
   Python on VM: 3.8.10
   
   ### Checklist
   
   Make sure to follow these steps before submitting your issue - thank you!
   
   - [ ] I have checked the superset logs for python stacktraces and included 
it here as text if there are any.
   - [ ] I have reproduced the issue with at least the latest released version 
of superset.
   - [ ] I have checked the issue tracker for the same issue and I haven't 
found one similar.
   
   ### Additional context
   
   I have checked issue code 1011 given in apache superset documentation but 
not able to find my mistake where i am going wrong.
   
   


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