Unable to start DHCP Server on M4Pro MacBook Pro, works on M4 iMac

When starting the DHCP server on my iMac with an M4 processor, it works just fine. Using the identical (except for the network adapter) configuration, I always get the error: Load failed: 5: Input/output error.

My /etc/bootpd.plist file is:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

<key>bootp_enabled</key>

<false/>

<key>detect_other_dhcp_server</key>

<integer>1</integer>

<key>dhcp_enabled</key>

<array>

<string>en0</string>

</array>

<key>reply_threshold_seconds</key>

<integer>0</integer>

<key>Subnets</key>

<array>

<dict>

<key>allocate</key>

<true/>

<key>lease_max</key>

<integer>86400</integer>

<key>lease_min</key>

<integer>86400</integer>

<key>name</key>

<string>10.0.0</string>

<key>net_address</key>

<string>10.0.0.0</string>

<key>net_mask</key>

<string>255.255.255.0</string>

<key>net_range</key>

<array>

<string>10.0.0.3</string>

<string>10.0.0.250</string>

</array>

</dict>

</array>

<key>use_server_config_for_dhcp_options</key>

<true/>

</dict>

</plist>

The network adapter is configured with IP address: 10.0.0.2 and subnet mask: 255.255.255.0.

I start and stop the DHCP server with the following commands:

sudo /bin/launchctl load -w /System/Library/LaunchDaemons/bootps.plist

sudo /bin/launchctl unload -w /System/Library/LaunchDaemons/bootps.plist

The only difference is that the iMac has a built in network adapter (en0), and the MacBook Pro has USB network adapter (en7).

Is there any way to correct this "Load failed: 5: Input/output error"?