Email-Valid | perl library to validate email addresses | Email library

I have deployed my flask project on heroku but for some reason I am getting this error

Application error An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command heroku logs --tail

Here's the tail log:-

While running the Pimcore6.9 along with the symfony4.4 I had spotted some warnings:

The MimetypeGuesser is depricated since symfony4.3 use MimeTypes instead.

I'm working on symfony 2.8 project and I'm new in it. Now I try to upgrade it to the newest version. I found the rector package for update the symfony (rector-prefixed exactly, for older version). I've install it and try to run like it is in documentation: https://github.com/rectorphp/rector, and got this error in the console:

I have Airflow deployed in virtual env and in case I try to execute PythonVirtualenvOperator with import of the Airflow module (to get Variables for example) it gives me the AttributeError. Guess I do not fully understand how Airflow executes VirtualenvOperator, and therefore what to do to overcome it, so any suggestions and insights will be highly appreciated

My test DAG code

I'm trying to configure OAuth authentication with GitHub apis, on Superset 1.0.1. Following the docs, I added the following lines in superset_config.py

Last days I try to upgrade my project step by step. I have Symfony 2.8, composer 2. Lately I found rector/rector package for upgrading, but there was conflicts when I try to install it. Next I try to install rector/rector-prefixed. It also gives many problems with installation, but after research I've update my php version to 7.4 and it goes good. I've made composer update and install, but in the meantime new error shows up. With AppKernel. Before there was everything good and the app works fine. Now I've got message in the browser: Composer detected issues in your platform: "Your Composer dependencies require a PHP version ">= 7.4.0". "

And in the console after every command (for example: php app/console list) now I'm getting this message:

I am writing basic test using Jest for my angular project. However, I get a weird missing semi-colon error that I cannot understand how to fix.

I'm trying to find some help installing apache-airflow.

I am on MacOS 10.15.7, Python version 3.8.2, and I keep getting an error:

ERROR: Could not build wheels for setproctitle which use PEP 517 and cannot be installed directly

I have tried using earlier versions of pip and python to no avail.

Does anyone know what I can do in this situation? I have looked at all the stack overflow questions that popped up with these search terms but none have presented a solution that worked for me so far.

Any help would be much appreciated.

I'm trying to create a custom async validator for my registration form where it checks if an email is a valid email or not using third party API. this is ref link of the API website -

https://www.zerobounce.net/email-validation-api.html

I am trying to implement it using RxJs debounceTime, distinctUntilChanged. In the form control I have two more validations required and pattern. But I am always getting this error - Error: Expected validator to return Promise or Observable.

I have searched several examples but nothing worked. Thank you in advance.

Validator -