user session expired error at first time but running fine after that

Please help me with this ridiculous problem. I am passing a URL from my js form by using window.open() function that will hit a controller method and also some path variable is included.. that is,

myUrl = "controller/"+pathVar1+"/"+pathVar2+"/controllerMethod?AUTH_TOKEN=" + getAuthTokenId() +"&";

window.open(myUrl,true);

getAuthTokenId() is written in my "global.js" file And in the controller I have written the method as

@Controller
@RequestMapping("/controller")
public class ControllerName{

  @RequestMapping(value = "/{pathVar1}/{pathVar2}/controllerMethod", method = RequestMethod.GET)
  public @ResponseBody void ControllerMethodDefinition(HttpServletRequest request, HttpServletResponse response, @PathVariable("pathVar1") String pathVar1,@PathVariable("pathVar2") String pathVar2){
        /***/
    }

} 

Now My problem is when first time the js is executing my call from js is not hitting the controller but next time onwards the controller is hit every time.