"ImportError: cannot import name 'ImmutableDict'" error when installing pgAdmin4

I am trying to install pgAdmin4 on Ubuntu 18.04 with python3 following this tutorial (https://www.digitalocean.com/community/tutorials/how-to-install-configure-pgadmin4-server-mode) but when configuring pgAdmin4 I get this error:

(my_env) 1 jess@hilarioserver:~/environments$ python my_env/lib/python3.6/site-packages/pgadmin4/setup.py
Traceback (most recent call last):
  File "my_env/lib/python3.6/site-packages/pgadmin4/setup.py", line 17, in <module>
    from pgadmin.model import db, User, Version, ServerGroup, Server, \
  File "/home/cta/environments/my_env/lib/python3.6/site-packages/pgadmin4/pgadmin/__init__.py", line 21, in <module>
    from flask_babelex import Babel, gettext
  File "/home/cta/environments/my_env/lib/python3.6/site-packages/flask_babelex/__init__.py", line 23, in <module>
    from werkzeug import ImmutableDict
ImportError: cannot import name 'ImmutableDict'

I already tried to install werkzeug but still giving the same error.

alembic (1.4.0) Babel (2.8.0) bcrypt (3.1.7) blinker (1.4) cffi (1.13.2) Click (7.0) cryptography (2.8) Flask (1.0.2) Flask-BabelEx (0.9.3) Flask-Compress (1.4.0) Flask-Gravatar (0.5.0) Flask-Login (0.4.1) Flask-Mail (0.9.1) Flask-Migrate (2.4.0) Flask-Paranoid (0.2.0) Flask-Principal (0.4.0) Flask-Security (3.0.0) Flask-SQLAlchemy (2.3.2) Flask-WTF (0.14.2) itsdangerous (1.1.0) Jinja2 (2.11.1) Mako (1.1.1) MarkupSafe (1.1.1) paramiko (2.7.1) passlib (1.7.1) pgadmin4 (4.18) pip (9.0.1) pkg-resources (0.0.0) psutil (5.5.1) psycopg2-binary (2.8.4) pycparser (2.19) PyNaCl (1.3.0) python-dateutil (2.8.1) python-editor (1.0.4) pytz (2018.9) setuptools (39.0.1) simplejson (3.16.0) six (1.14.0) speaklater (1.3) SQLAlchemy (1.3.13) sqlparse (0.2.4) sshtunnel (0.1.5) Werkzeug (1.0.0) wheel (0.34.2) WTForms (2.2.1)

Any idea?

Solution

I've been troubleshooting this today while installing another package as well and it seems there was a new version released today that might be causing the issue.

https://pypi.org/project/Werkzeug/#history

I decided to go back to an earlier version (0.16.1) and it solved my issue. To downgrade:

pip install --upgrade werkzeug==0.16.1

Hope this works for you as well.