Displaying array with no objects of call sites.

[jainAdijain]

Hi I am using the stack-trace as follows:

//required stack-trace

func.todo =  function (todo.id,cb){
var trace = stackTrace.get(func.todo);
console.log('Trace', trace);

//more function calls
}

The console displays the output as follows:

Trace [ callSite{},
callSite {},
callSite{},
"
"
"
"
"
callSite{}]

Proper callsite names and the objects of every call site is not displayed.
But when I use

var err= 'Something went wrong';
var trace = stackTrace.parse(err);

The proper callSites with names and their objects are displayed.

Why is this so?