SlimFTPd 3.181 Virtual Locations Issue

Can somebody tell me why Windows Network shares can't be added as locations in SlimFTPd? I mean, I'm a little disappointed here... I have a 500 GB drive in my other computer, mapped to Drive Z: on the server machine, that I want the FTP server to have access to but I can't because SlimFTPd won't allow me to share a network drive, unless I've missed something?

.CONF Mapping:

<User "**********">
Password "************"
Mount / G:\HTTPROOT\uploads
Mount /500-GB Z:\
Allow / all
</User>


Server Log:

[29/07/2012 3:02:09 AM] -------------------------------------------------------------------------------
[29/07/2012 3:02:09 AM] SlimFTPd 3.181, by WhitSoft Development (www.whitsoftdev.com)
[29/07/2012 3:02:09 AM] The SlimFTPd service is starting.
[29/07/2012 3:02:09 AM] Executing "SlimFTPd.conf"...
[29/07/2012 3:02:09 AM] Error on line 87: Mount directive cannot find local path "Z:".
[29/07/2012 3:02:09 AM] Failed parsing configuration script.
[29/07/2012 3:02:09 AM] An error occurred while starting SlimFTPd.
[29/07/2012 3:02:09 AM] The SlimFTPd service has stopped.