Help With - Failing descriptor: {c:TrainingLightningAppOutlookNameCompo} on LWC

Hello ,

I am getting ""Failing descriptor: {c:TrainingLightningAppOutlookNameCompo}""  . What could be the possible reason ? 

<aura:application extends="force:slds">
    <c:TrainingLightningAppOutlookNameCompo />
</aura:application>

<aura:component>
    <ui:inputText label="First Name" aura:id="FirstName" placeholder="First Name"/>
    <ui:inputText label="Last Name" aura:id="LastName" placeholder="Last Name"/>
    <ui:button aura:id="ButtonToAction" label="Submit"  press="{!c.getInfo}"/>
    <ui:outputText aura:id="NameToDisplay" value=""/>
</aura:component>

({
	getInfo : function(component) {
        var firstName = component.find("FirstName").get("v.value");
        var lastName = component.find("LastName").get("v.value");
        var outputName = component.find("NameToDisplay");
        outputName.set("v.value",lastName + firstName );
	}
})

Unable to figure out, appreciate your help on this. 

Thanks Amit