pgAdmin4 doesn't work after system update

Today morning, I updated my system using
sudo pacman -Syu
Then pgAdmin4 and some python modules got updated.
But now I’m unable to run pgAdmin4. When I run below command in terminal:
$ pgadmin4
I’ll get below error:

QCoreApplication::applicationFilePath: Please instantiate the QApplication object first
QCoreApplication::applicationFilePath: Please instantiate the QApplication object first
Semaphore name: "pgadmin4-milad-a59283b86ae8ae85d20fdf770d799dd7-sema"
Shared memory segment name: "pgadmin4-milad-a59283b86ae8ae85d20fdf770d799dd7-shmem"
Python path:  "/usr/lib/python3.9:/usr/lib/python3.9/lib-dynload:/usr/lib/python3.9/site-packages" 
Python Home:  "/usr/lib/python3.9"
Webapp path:  "/usr/lib/pgadmin4/web/"
"An error occurred initialising the pgAdmin 4 server:\n\nFailed to launch the application server, server thread exiting."

On other hand, I’m sure postgres service is running correctly because I can execute any query using $ psql command.
I google for the solution but I’m unable to resolve it yet :pensive:
Here is my system info:

OS: Manjaro 21.0.6`

Kernel: x86_64 Linux 5.4.123-1-MANJARO`

Hi. I have the same problem here.
If I then manually start pgadmin4-server from the command line, I get:

> pgadmin4-server 
Traceback (most recent call last):
  File "/usr/lib/pgadmin4/web/", line 35, in <module>
    import config
  File "/usr/lib/pgadmin4/web/", line 25, in <module>
    from pgadmin.utils import env, IS_WIN, fs_short_path
  File "/usr/lib/pgadmin4/web/pgadmin/", line 28, in <module>
    from flask_security import Security, SQLAlchemyUserDatastore, current_user
  File "/usr/lib/python3.9/site-packages/flask_security/", line 15, in <module>
    from .core import Security, RoleMixin, UserMixin, AnonymousUser, current_user
  File "/usr/lib/python3.9/site-packages/flask_security/", line 48, in <module>
    from .mail_util import MailUtil
  File "/usr/lib/python3.9/site-packages/flask_security/", line 14, in <module>
    import email_validator
ModuleNotFoundError: No module named 'email_validator'

package is flagged as last aur package

for replace exists as clients (linux) or (web)

Thanks. I have just installed DBeaver. It works nicely.

Wow, I didn’t know it is out of date :cry:
Thank you :smiley:

So is support for pgAdmin being dropped and we should switch to other tools?

I can see that pgAdmin has broke many times before on both arch and manjaro.
It is unfurtunate becuase I use for work to manage multiple databases at a glance.
You would think a tool like this could be easily packaged as a standalone but apparently not.
I really wanted DBeaver to be good, but its very buggy for me for some reason.

1 Like

pgAdmin4 is in python, pgAdmin3 is in C++.
In my experience, pgAdmin3 is better.
pgAdmin4 is easy to be broken, it implies that it is not high quality, disappointed.

1 Like

Guys, i also had the same problem, i kept researching until i found out that pgAdmin has an installable pip(python package manager) version, i think it’s exactly the same one that you used to run when downloading via pacman, you can find the instructions here, it took me a minute to install it following the instructions:

yes it was in bug repport : pgadmin4 not run with flask 2 but is ok with flask 1
install en venv is ok

This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.