C9 sdk on ubuntu not run the nodejs app

nodejs

#1

c9 sdk on ubuntu not run the nodejs app , everything working just if you click rung it will say running and do nothing , no any error or text on c9 console, i see the browser console have 2 errors

Failed to load resource: the server responded with a status of 499 (unknown) vfs/1/9cKWy4081GagVec1?access_token=token:1 
http-xhr.js:126 HTTP error 499: {"error":{"code":499,"scope":"standalone","message":"VFS connection does not exist"}}

i install c9 sdk on windows working without any problem and i din’t see any errors on browser console but on ubuntu this errors show on the browser console and runner not working

i reinstalled c9 sdk but not solved