Why isn't this .plist working?

There she 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>Label</key>
    <string>Titan Server</string>
    <key>ProgramArguments</key>
    <array>
        <string>/Users/Ian/Titan/bin/titan.sh</string>
        <string>start</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>WorkingDirectory</key>
    <string>/Users/Ian/Titan</string>
</dict>
</plist>

      

        
        
        
      

    

If I go to the terminal and do ...

launchctl load "Titan Server.plist"

      

        
        
        
      

    

... He says...

/ Library / LaunchAgents / Titan Server.plist: Operation already in progress

AND?

If I go to the working directory manually and enter the command, it works fine.