Error while using Meteor.wrapAsync. "Error: the future is resolved more than once"

I am using Meteor.wrapAsync to wrap my standard node.js "sendMessage" function.

And I am using looping to call Meteor.wrapAsync and execute sendMessageSync.

But then I got the error: "Error: the future is resolved more than once"

Why did I get this error?

Here is my code:

//Every 10 seconds get messages and send.
Meteor.setInterval(function () {
    var messages = getMessagesFromDb();

    //Send message every two seconds.
    Meteor.setInterval(sendAllMessages, 2000);

    var i = 0;

    function sendAllMessages() {
        if (i++ < messages.length) {
            //Get the sync version of sendMessage.
            var sendMessageSync = Meteor.wrapAsync(sendMessage);

            var result = sendMessageSync('is4ags', messages[i - 1]);

            //Error:  "Exception in callback of async function: Error: Future resolved more than once"
            console.log('sendMessage response: ' + result);
        }
    }
}, 10000);

//sendMessage is standard node.js function that accept callback.
function sendMessage(toAddress, message, cb) {
    //sendMessage Implementations.
}