I can't figure out how to initialize two instances of `tinymce` on my page.

I've tried the answer from [this question](https://stackoverflow.com/questions/26839614/initialize-tinymce-with-content/) but no luck. Do I need to use a timeout if it takes some time to finish initializing the first one (io) before starting to initialize the second one (co)? 

```
var io = {
   selector:"#auth_info_intro textarea",
   ...,
   setup:function(ed){
      ed.on("init",function(e){
         tinyMCE.activeEditor.setContent(obj.INFO.INTRO.TEXT);
      });        
   }
};
var co = {
   selector:"#auth_info_conclude textarea",
   ...,
   setup:function(ed){
      ed.on("init",function(e){
         tinyMCE.activeEditor.setContent(obj.INFO.CONCLUDE.TEXT);
      });         
   }
};
tinymce.init(io);
tinymce.init(co);

```

The above throws `Uncaught TypeError: Cannot read property 'body' of undefined`.
What am I missing?