pgadmin4 - cannot run on Fedora 24

Hi

I successfully compiled pgAdmin, but any run fails with error

[pavel(at)nemesis runtime]$ ./pgAdmin4
Traceback (most recent call last):
File "/home/pavel/src/pgadmin4/web/pgAdmin4.py", line 24, in <module>
from pgadmin import create_app
File "/home/pavel/src/pgadmin4/web/pgadmin/__init__.py", line 13, in
<module>
from flask import Flask, abort, request, current_app
ImportError: No module named 'flask'

but flask module is installed there

[pavel(at)nemesis runtime]$ python
Python 3.5.1 (default, Mar 4 2016, 15:21:15)
[GCC 6.0.0 20160302 (Red Hat 6.0.0-0.14)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from flask import Flask
>>>

Any help?

Regards

Pavel