[SalesForce] Something has gone wrong. $Lightning is not defined. Please try again

When i am previewing the Lightning APP it is giving error

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

Mainly this is happening after salesforce update. Is there anything to do with that ?

<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> 

VFPAGE:

<apex:page standardStylesheets="false" sidebar="false">

    <div style="vertical-align: top; margin-top: -650px;">
        <apex:includeLightning />
        <div id="lightning" />

        <script>

        $Lightning.use("c:AccApp", function() {
          $Lightning.createComponent("c:AccountInfoComponent",
          { Label : " " },
          "lightning",
          function(cmp) {
            // do some stuff
          });
        });
    </script>
    </div>


</apex:page>