• Kakasaheb Ekshinge
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I have below code so I run this ...
<aura:component implements="force:appHostable">
    Enter three values:<br/>
    <ui:inputNumber aura:id="inputOne" label="Input One" /><br/>
    <ui:inputNumber aura:id="inputTwo" label="Input Two"/><br/>
    <ui:inputNumber aura:id="inputThree" label="Input Three"/><br/>
    <ui:button label="Calculate value" press="{!c.calculate}"/><br/>
    <ui:outputNumber aura:id="totalValue" value=""/>

*Controller is *
    calculate : function(component, event, helper) {
        var input1=component.find("inputOne").get("v.value");
        var input2=component.find("inputTwo").get("v.value");
        var input3=component.find("inputThree").get("v.value");
        var totalval=parseInt(input1)+parseInt(input2)-parseInt(input3);
        var outputval = component.find("totalValue");
        outputval.set("v.value", totalval);


Hello I'm new to Salesforce and I'm doing the trailhead to learn.
But I'm stuck at this challenge in Lightning Module.

Here's the challenge:
Create a simple Lightning component with a styled headline. The headline must use an H1 tag with a CSS class that enforces a 24px font-size. Make the component available in the Navigation Menu of Salesforce1.The component must be named 'MyLightningComponent'.
The component must include an H1 tag with a CSS class named 'headline'. The 'headline' CSS class must set a font-size of 24px.
The Lightning Component tab that is added to Salesforce1 must be called 'MyLightning'.

And here's what I did:


<aura:component implements='force:appHostable'>
    <div class="headline">
    <h1>My Lightning Component</h1>
    <h1>Hello Lightning App!</h1>
    <c:MyLightningComponent />



I created the tabs in the Salesforce1 and everithing looks right but I can't pass the challenge because it's aways return a error saying "The component does not include an H1 tag with a 'headline' CSS class"

I do no what to do with this error.