Errors after starting rpi-mqtt-monitor.service

[kokomatamata]

Hi:
When I start rpi-mqtt-monitor.service, I see the following error after running: sudo systemctl status rpi-mqtt-monitor (screenshot attached).

I'm not sure if my rpi-mqtt-monitor.service file is incorrect (apologies, I'm not very experienced with this):
#######################################
[Unit]
Description=RPI MQTT Monitor
After=network-online.target
Wants=network-online.target

[Service]
ExecStart=/home/bdd1/rpi-mqtt-monitor/rpi_mon_env/bin/python /home/bdd1/rpi-mqtt-monitor/src/rpi-cpu2mqtt.py --service --hass_api
Environment="HOME=/home/bdd1"
WorkingDirectory=/home/bdd1/rpi-mqtt-monitor
StandardOutput=inherit
StandardError=inherit
Restart=always
RestartSec=5
User=bdd1

[Install]
WantedBy=multi-user.target
#######################################

However, when I start the program manually using "rpi-mqtt-monitor -d", I can see topics being sent once to Home Assistant, and the following output appears in the terminal:

#######################################
:: rpi-mqtt-monitor :: v 1.1.2

:: Device Information
Model Name: Raspberry Pi Zero W Rev 1.1
Manufacturer: Raspberry Pi
OS: Raspbian GNU/Linux 12 (bookworm)
Hostname: raspberrypiw
IP Address: 192.168.1.23
MAC Address: B8-27-EB-EF-A3-DC
Service Sleep Time: 2 seconds
Update Check Interval: 3600 seconds

:: Measured values
CPU Load: 27.0 %
CPU Temp: 40.62 �C
Used Space: 22 %
Memory: 49 %
Online since: 2025-02-12T23:18:42Z
Wifi Signal: 100 %
Wifi Signal dBm: -33 dBm

:: Installation directory :: /home/bdd1/rpi-mqtt-monitor
#######################################

How can I fix this issue? Thanks in advance! Also, I appreciate your work on this project.