Error while Installing SmartApp in the IDE

I get this weird error when trying to install this very simple app in the IDE. Any pointers? Code is at the bottom which is incomplete.

grails.validation.ValidationException: Validation Error(s) occurred during save():

  • Field error in object ‘physicalgraph.device.Device’ on field ‘name’: rejected value [null]; codes [physicalgraph.device.Device.name.nullable.error.physicalgraph.device.Device.name,physicalgraph.device.Device.name.nullable.error.name,physicalgraph.device.Device.name.nullable.error.java.lang.String,physicalgraph.device.Device.name.nullable.error,device.name.nullable.error.physicalgraph.device.Device.name,device.name.nullable.error.name,device.name.nullable.error.java.lang.String,device.name.nullable.error,physicalgraph.device.Device.name.nullable.physicalgraph.device.Device.name,physicalgraph.device.Device.name.nullable.name,physicalgraph.device.Device.name.nullable.java.lang.String,physicalgraph.device.Device.name.nullable,device.name.nullable.physicalgraph.device.Device.name,device.name.nullable.name,device.name.nullable.java.lang.String,device.name.nullable,nullable.physicalgraph.device.Device.name,nullable.name,nullable.java.lang.String,nullable]; arguments [name,class physicalgraph.device.Device]; default message [{0} cannot be null]

Code:

// Automatically generated. Make future change here.
definition(
    name: "Sonos Notifier",
    namespace: "rsarkar",
    author: "Ron Sarkar",
    description: "Notifies door open/close messages",
    category: "My Apps",
    iconUrl: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience.png",
    iconX2Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png",
    iconX3Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png")

preferences {
	section("Choose one or more, when..."){
		input "contact", "capability.contactSensor", title: "Contact Opens", required: false, multiple: true
		input "contactClosed", "capability.contactSensor", title: "Contact Closes", required: false, multiple: true
	}

	section("Speak This Text"){
		input "message", "text", title: "Sonos to speak", required: false
    }	

	section {
		input "sonos", "capability.musicPlayer", title: "Sonos Device", required: true
	}
}

def installed() {
	log.debug "Installed with settings: ${settings}"
	subscribeToEvents()
}

def updated() {
	log.debug "Updated with settings: ${settings}"
	unsubscribe()
	subscribeToEvents()
}

def subscribeToEvents() {
	subscribe(contact, "contact.open", eventHandler)
	subscribe(contactClosed, "contact.closed", eventHandler)
}

def eventHandler(evt) {
	takeAction(evt)
}

private takeAction(evt) {
    def currentStatus = sonos.currentValue("status")
	def currentVolume = sonos.currentState("level")?.integerValue
	def currentTrack = sonos.currentState("trackData").jsonValue    
}