When i am previewing the Lightning APP it is giving error

 

> Something has gone wrong. $Lightning is not defined. Please try
> again.

    <aura:application access="GLOBAL" extends="ltng:outApp" implements="force:appHostable">
       <c:load filesInSeries="/resource/CommunityStore/jquery-1.11.2.min.js,/resource/CommunityStore/bootstrap/bootstrap.js,/resource/CommunityStore/bootstrap/bootstrap.css,/resource/CommunityStore/style.css"/>  
       <c:AccountInfoComponent/>
    </aura:application>