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vasudeva gorakativasudeva gorakati 

Data Integration Specialist Step 7

Following when I clicked check challenge and there seems to be end point is down

Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.CalloutException: IO Exception: External server did not return any content
vasudeva gorakativasudeva gorakati
I am getting following error  and it seems to me that end point is down

HTTP/1.1 500 
X-Bst-Request-Id: C24P4h:PFsc:140444
X-Bst-Info: t=1500517150,h=14m,p=55976_5362:2_11814,u=385416618,c=2339,v=7.9.58904.78
Server: Cowboy
Content-Type: application/json;charset=UTF-8
Date: Thu, 20 Jul 2017 02:19:09 GMT
Via: 1.1 vegur, 1.1 hosted.websense 14m
Content-Length: 173
Connection: keep-alive

{"timestamp":1500517149905,"status":500,"error":"Internal Server Error","exception":"java.lang.OutOfMemoryError","message":"unable to create new native thread","path":"/ws"}

Request body
=============
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:inv="http://salesforce.com/th/invoice-web-service">
   <soapenv:Header/>
   <soapenv:Body>
      <inv:billProjectRequest>
         <inv:project>
            <inv:username>bsUser1</inv:username>
            <inv:password>bsPass1</inv:password>
            <inv:projectRef>6df72ea0-7c96-4b5c-9662-1f4b55b55d5d</inv:projectRef>
            <inv:billAmount>1200.00</inv:billAmount>
         </inv:project>
      </inv:billProjectRequest>
   </soapenv:Body>
</soapenv:Envelope>

Endpoint
============
http://sb-integration-bs.herokuapp.com:80/ws