I tried running my server but kept getting an error message on django admin - django-admin

I am getting an error and my django admin cannot run.i tried running the server but it didn't work. It gave an error message

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I am getting below error in jenkins. how to resolve the error?

I created an ec2 instance in aws . And installed jenkins in it through mobaxterm after installation of jenkins i am getting an error while adding git repo (an internal error occurred during form field validation (http:500). please reload the page and if the problem persists ask the administrator.)

API endpoints returning 500 err after deploy on Heroku

The API endpoint is working fine on my local machine but when I deploy my Rails project to Heroku, some endpoints are returning 500 Internal Server Error. My tech pack is below, because I could not find a way to watch Rails log messages on Heroku, I could not share anym detailed information. What can be helpful for me is general answers for 500 error, like what could cause this and maybe a way of inspecting Rails log messages on Heroku. Thanks.
MongoDB, ElasticSearch, Redis, Swagger
The error message on Heroku logs is Completed 500 Internal Server Error in 27ms (MongoDB: 0.0ms)
Additionally, on my local I get the following error but the endpoint is returning 200 OK. HTTP parse error, malformed request ()
I realized that the problem is BONSAI connection on ElasticSearch Gem is not supported on versions > 7.13

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I just built my first shopify app. It looks to run well when working on localhost using ngrok. But when I upload my application to hosting, I get an error message when trying to install the application via shopify.
"Error. An error occurred while processing your request."
I've done all the possible steps in my head, but I have not been able to cope. Please give me a solution.

Getting websockets 404 Error on Rails 5 Deployment to Heroku

I'm deploying a simple Rails 5 app (https://morseaa.herokuapp.com/) to Heroku and cannot seem to get websockets to function correctly. The app works perfectly fine on local host, but whenever websockets functionality is invoked on the heroku deployment, I get the following error:
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Rails app don't work on passenger after changing database

I got rails app deployed on passanger with apache.
Before app works on local firebird database, after i changed credentials to database server in company but located on another pc i got this error.
An error occurred while starting up the preloader: it did not write a startup response in time.
Raw process output:
(empty)
Error ID
06c3cb78
When i start rails app with this database on my local machine with RAILS_ENV=production rails s it works fine.
Does anybody got this error before and know how to solve this?
That was my mistake. There was error with dns on server, my production server 'don't see database srv'

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