how Update an item in an array that is in an array in mongoose

I have a document in a mongodb collection like this :

{
   id: String,
   username: String,
   password: String,
   email: String,
   user_messeges: [{
                     mail:String,
                     messeges:[ {String} ]
                  }]
}

And i want to update messeges array in user_messeges array.

i used this mathod but i got error: "The positional operator did not find the match needed from the query. Unexpanded update"

User.update({'user_messeges.email':my_email},{$push : {'user_messeges.$.messages':msg}},{upsert:true},function(err)...

How can I do this ?

Thanks for help.