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Kumar Gaurav 4Kumar 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
Best Answer chosen by Shashank (Salesforce Developers) 
ShashankShashank (Salesforce Developers) 
This was a known issue and should have been fixed with the winter 16 release: http://salesforce.stackexchange.com/questions/95324/unable-to-create-aurahandler-tag-in-lightning-in-trailhead-component-module

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Chandra Sekhar CH N VChandra Sekhar CH N V
what's the component name?
Kumar Gaurav 4Kumar Gaurav 4
<!-- receiver.cmp -->

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>
ShashankShashank (Salesforce Developers) 
This was a known issue and should have been fixed with the winter 16 release: http://salesforce.stackexchange.com/questions/95324/unable-to-create-aurahandler-tag-in-lightning-in-trailhead-component-module
This was selected as the best answer