Catalina - LaunchAgents - Load error 5: input/output error

Hi all,

I am having a mysterious problem trying to load a user LaunchAgent under Catalina - It is the .plist of gniemetz's automount.sh

https://github.com/gniemetz/automount 

for mounting SMB shares via pwd access from the Keychain -

Placed the .sh into /usr/local/bin, chmod 644 and chown user:staff

Placed the LaunchAgent .plist into ~/Library/LaunchAgents (created LaunchAgents it as it didn't exist), same chmod/chown.

~/Library 
drwxr-xr-x    3   users     96 Nov  1 22:13 LaunchAgents

~/Library/LaunchAgents
-rw-r--r--    1   users   1038 Nov  1 22:13 it.niemetz.automount.plist

/usr/local 
drwxr-xr-x    4   root    wheel 128 Nov  1 21:52 bin

/usr/local/bin
-rwxr-xr-x    1   root    wheel 30310 Oct 29 21:58 automount.sh

then the following:

launchctl load -w ~/Library/LaunchAgents/it.niemetz.automount.plist 
Load failed: 5: Input/output error

For the life of me, I cannot find anywhere what this means...

launchctl start ~/Library/LaunchAgents/it.niemetz.automount.plist 

completes with no errors, syntax also parses OK

-lint ~/Library/LaunchAgents/it.niemetz.automount.plist 
/Users//Library/LaunchAgents/it.niemetz.automount.plist: OK

I have added Terminal and /bin/bash to Full Disk Access under Security...

Launching the script manually as /usr/local/bin/automount.sh works fine.

Console shows

launchctl load: 
system.log shows this when load -w is run:

00:27:14 mac-mini com.apple.xpc.launchd[1] (com.apple.xpc.launchd.user.domain.1000002.100006.Aqua): entering bootstrap modeNov  3 
00:27:14 mac-mini com.apple.xpc.launchd[1] (com.apple.xpc.launchd.user.domain.1000002.100006.Aqua): exiting bootstrap mode

For easy reference the .plist is pasted at the end -

Anyone seen this error before?

Thanks!

++

<?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>Label</key>
		<string>it.niemetz.automount</string>
		<key>LimitLoadToSessionType</key>
		<string>Aqua</string>
		<key>RunAtLoad</key>
		<true/>

		<key>WatchPaths</key>
		<array>
			<string>/etc/resolv.conf</string>
			<string>/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist</string>
			<string>/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist</string>
		</array>
		<key>ProgramArguments</key>
		<array>
			<string>/usr/local/bin/automount.sh</string>
			<string>--mountall</string>
		</array>
	</dict>
	</plist>