pgadmin4 not working

Hi All,

After a few releases, I'm interested in trying pgadmin4 again.

Epicly failing at launch:

markm {~} kobaz$ pgadmin4
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kobaz'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kobaz'
Python path: 
"/home/kobaz/.virtualenvs/pgadmin4/lib/python3.4/site-packages:/usr/lib/python3/dist-packages"
Python Home:  ""
Webapp path:  "/usr/share/pgadmin4/web/pgAdmin4.py"
"Failed to launch the application server, server thread exiting."


Debian: stretch
Src: deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main

$ dpkg -l | grep pgadmin4
ii  pgadmin4 
3.5-1.pgdg90+1                               amd64        PostgreSQL 
management tool - GUI application
ii  pgadmin4-common 
3.5-1.pgdg90+1                               all          PostgreSQL 
management tool - common files