Solution
[Unit]
Description=Flask web server
[Service]
User=schirag
PermissionsStartOnly=true
ExecStart=/usr/bin/python3 /home/schirag/server.py
TimeoutSec=600
Restart=on-failure
RuntimeDirectoryMode=755
[Install]
WantedBy=multi-user.target
[Unit]
Description=Flask web server
[Service]
User=schirag
PermissionsStartOnly=true
ExecStart=/usr/bin/python3 /home/schirag/server.py
TimeoutSec=600
Restart=on-failure
RuntimeDirectoryMode=755
[Install]
WantedBy=multi-user.target