cordova exception

gistfile1.sh

boxysean@boxysean-ubook:~/workspace/BikeFIRMA-mobile$ cordova --verbose ripple android
Wrote out Android application name to "BikeFIRMA"
Wrote out Android package name to "com.dash7design.bikefirma"
Error: Invalid listen argument: 
    at Server.listen (net.js:1098:13)
    at Function.app.listen (/usr/local/lib/node_modules/cordova/node_modules/ripple-emulator/node_modules/express/lib/application.js:533:24)
    at Object.module.exports.start (/usr/local/lib/node_modules/cordova/node_modules/ripple-emulator/lib/server/index.js:33:13)
    at Object.module.exports.start (/usr/local/lib/node_modules/cordova/node_modules/ripple-emulator/lib/server/emulate.js:31:26)
    at /usr/local/lib/node_modules/cordova/src/ripple.js:27:24
    at /usr/local/lib/node_modules/cordova/src/serve.js:130:9
    at Object.module.exports.update_project (/usr/local/lib/node_modules/cordova/src/metadata/android_parser.js:218:23)
    at Function.module.exports.config (/usr/local/lib/node_modules/cordova/src/serve.js:127:12)
    at CLI.module.exports (/usr/local/lib/node_modules/cordova/src/ripple.js:26:11)
    at new CLI (/usr/local/lib/node_modules/cordova/src/cli.js:95:26)