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Typically you instruct systemd to run a service as a specific user/group with a User= and Group= directive in the [Service] section of the unit file.
The error code indicates the command is found but is not executable.
Is this service running under your user context? Generally when I am building a system service I put it under /etc/systemd/system and it runs as root without issues unless I specify.
Just make sure you plant native trees! The last thing we need is invasive species.