Error when starting seahub with 7.0.5

Hello,
I make a fresh install of SeaFile 7.0.5 on raspberry pi 4 with Raspbian Buster.
Every thing works fine except the last command ./seahub.sh start that gives me errors below.

(…)
Starting seahub at port 8000 …

  • check_init_admin
  • check_init_admin_script=/home/pi/SeaFile/seafile-server->7.0.5/check_init_admin.py
  • python2.7 /home/pi/SeaFile/seafile-server-7.0.5/check_init_admin.py
  • python2.7 /home/pi/SeaFile/seafile-server-7.0.5/seahub/thirdpart/gunicorn seahub.wsgi:application -c /home/pi/SeaFile/conf/gunicorn.conf --preload
  • sleep 5
  • pgrep -f seahub.wsgi:application
  • printf ‘\033[33mError:Seahub failed to start.\033[m\n’
    Error:Seahub failed to start.
  • echo ‘Please try to run “./seahub.sh start” again’
    Please try to run “./seahub.sh start” again
  • exit 1

When I try bash -x python2.7 /home/pi/SeaFile/seafile-server-7.0.5/seahub/thirdpart/gunicorn seahub.wsgi:application -c /home/pi/SeaFile/conf/gunicorn.conf --preload, the system explain that it can’t execute binary file.

What must I do to fix it ?

Have a nice day.