I can't get the attribute trough Lightning Event. By clicking on the button "Get msg" I get `undefined`:

ceEvent.evt:

<aura:event type="COMPONENT">
		<aura:attribute name="message" type="String" default="111"/>
</aura:event>

ceNotifier.cmp:
 

<aura:component>
			<aura:attribute name="msg" type="String"/>
			<aura:registerEvent name="cmpEvent" type="c:ceEvent"/>
			<aura:handler name="cmpEvent" event="c:ceEvent" action="{!c.handleComponentEvent}"/>
			<lightning:button label="Get msg" onclick="{!c.getMsg}" />
			<p>{!v.msg}</p>
		</aura:component>

ceNotifierController.js:

({ 
			handleComponentEvent : function(cmp, event) {
				var cmpEvent = cmp.getEvent("cmpEvent");
				var message = cmpEvent.getParam("message");
				cmp.set("v.msg", message);
				alert(message);
			},
			
			getMsg : function(cmp, event) {
				var cmpEvent = cmp.getEvent("cmpEvent");
				var message = cmpEvent.getParam("message");
				alert(message);
			}, 
		})

ceHandler.cmp:

<aura:component>
			<aura:attribute name="messageFromEvent" type="String"/>
			<aura:handler name="cmpEvent" event="c:ceEvent" action="{!c.handleComponentEvent}"/>
			<aura:registerEvent name="cmpEvent" type="c:ceEvent"/>
			<lightning:button label="Send msg" onclick="{!c.fireComponentEvent}" />
			<c:ceNotifier />
		</aura:component>

ceHandlerController.js:

({
			handleComponentEvent : function(cmp, event) {
				var message = event.getParam("message");
				cmp.set("v.messageFromEvent", message);
				alert(message);
			},
			
			fireComponentEvent : function(cmp, event) {
				var cmpEvent = cmp.getEvent("cmpEvent");
				cmpEvent.setParams({"message" : "Here we go"});
				cmpEvent.fire();
				alert(cmpEvent.getParam("message"));
			}
		})

ceApp.app:

        <aura:application >
			<c:ceHandler/>
		</aura:application>

What am I doing wrong? How do i get an attribute?