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Kumar Gaurav 4
Trailhead Issue - Failed to save undefined: aura:handler must specify one and only one of name="…" or event="…": Source
Try this section - Component Event Example
function readOnly(count){ }
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2 <aura:component>
3 <aura:attribute name="myText" type="String" default="None"/>
4 <aura:handler name="messageEvent" event="c:theMessage" action="{!c.answer}"/>
5 <c:sender />
6 Message: {!v.myText}
7 </aura:component>