I am going after the Lightning Experience roll-out specialist badge and I am having issues with challenge #10. Could you give me some pointers on how to finish this challenge?  

Here is my error : The Lightning component named TrailheaDX must open a link to https://developer.salesforce.com/trailheadx/, must open in a new window (using the target attribute of ui:outputurl), and must be included in the Sales app. 

Here is my code 

Component : 

<aura:component implements="flexipage:availableForAllPageTypes" access="global" >
    <aura:attribute name="myURL" type="String" default="https://developer.salesforce.com/trailheadx/"/>
    <br/><br/>
    <ui:outputURL value="{!v.myURL}" label="TrailheaDX" target="_blank"/>
    <br/>
</aura:component>



Controller : 


({
    navigate : function(component, event, helper) {
        var address = component.find("address").get("v.myURL");
        var urlEvent = $A.get("e.force:navigateToURL");
        urlEvent.setParams({
            "url": 'https://developer.salesforce.com/trailheadx/' + address
        });
        urlEvent.fire();
    }
})




In addition, i added the app to the utility bar and the homepage of the lightning sales app. 

Could you give me any pointers on how to finish this challenge? 

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