Problem with cannot use the method of object return

I'm using TC v8.72, is trying to use TC to test WPF application and using Jscript.

I need to use the method of object return, but TC keeps coming back with an error as below:-





----There was an attempt to perform an action at a point, which is beyond the screen. -----




function checkFunc()

{

  var instrC = Aliases.TestedApps;

  var IdCheck = findId();

  IdCheck.Click();

}



function findId()

{

  var instrC = Aliases.TestedApps;    

  var FindObj = instrC.Find("Id","1990",20000);

  return FindObj;

}



is there anything wrong in my script or? thanks with your help...