I installed Postgres9.6 ver And pgAdmin4 was installed together. But It is return message "The application server could not be contacted" When i execute pgadmin.
I tried to download and install pgAdmin4 from web. But have not changed anything.
I couldn't get anything Although I searched google about the message.
I Set System Path, And Postgres is running in my local. But pgadmin don't start up.
Do somebody know about this? Thank you.
update:
i found this question.
I think that is same my problem which got 3 good vote even if the message is different a little.
So i'm trying do that, But can't run setup.py.
I installed python. and run pgAdmin\web\setup.py with cmd as admin.
But fail with message of
from flask import Flask No module named 'flask'
thank you.
Answer
I had the same problem with pgAdmin 4 1.5 on Windows 10 Professional. The solution was simply to delete %appdata%\pgAdmin which was created by an earlier version. On systems other than Windows, there probably is a pgAdmin directory in your user directory. Of course, all session settings etc. are gone after deleting this.