Failed Cordova FirefoxOS Build

Z:\MobileDev\hello>cordova build
Generating config.xml from defaults for platform "amazon-fireos"
Preparing amazon-fireos project
Generating config.xml from defaults for platform "android"
Preparing android project
Generating config.xml from defaults for platform "blackberry10"
Preparing blackberry10 project
Generating config.xml from defaults for platform "firefoxos"
Preparing firefoxos project
Generating config.xml from defaults for platform "windows8"
Preparing windows8 project
Generating config.xml from defaults for platform "wp7"
Preparing wp7 project
Generating config.xml from defaults for platform "wp8"
Preparing wp8 project
Compiling app on platform "amazon-fireos" via command "cmd" /c Z:\MobileDev\hello\platforms\amazon-fireos\cordova\build
Compiling app on platform "android" via command "cmd" /c Z:\MobileDev\hello\platforms\android\cordova\build
Compiling app on platform "blackberry10" via command "cmd" /c Z:\MobileDev\hello\platforms\blackberry10\cordova\build
Compiling app on platform "firefoxos" via command "cmd" /c Z:\MobileDev\hello\platforms\firefoxos\cordova\build
Compiling app on platform "windows8" via command "cmd" /c Z:\MobileDev\hello\platforms\windows8\cordova\build
Compiling app on platform "wp7" via command "cmd" /c Z:\MobileDev\hello\platforms\wp7\cordova\build
Compiling app on platform "wp8" via command "cmd" /c Z:\MobileDev\hello\platforms\wp8\cordova\build

C:\Users\deltahost\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:126
                    throw e;
                          ^
Error: An error occurred while building the firefoxos project.'Z:\MobileDev\hello\platforms\firefoxos\cordova\build' is not recognized as an inte
rnal or external command,
operable program or batch file.

    at ChildProcess.<anonymous> (C:\Users\deltahost\AppData\Roaming\npm\node_modules\cordova\src\compile.js:65:22)
    at ChildProcess.EventEmitter.emit (events.js:98:17)
    at maybeClose (child_process.js:735:16)
    at Socket.<anonymous> (child_process.js:948:11)
    at Socket.EventEmitter.emit (events.js:95:17)
    at Pipe.close (net.js:466:12)