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">
   <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"/>  
    <aura:dependency resource="c:AccountInfoComponent"/> 
</aura:application>