Trying to developp my companion app, but cannot receive phone data

My Android app is almost ready, and I am sending a message with Andoid :

myConnectIQ.sendMessage(iqdevice, mMyApp, json new ConnectIQ.IQSendMessageListener() {.....}

My json object is [{"name":"Dudu","lat":40.07947,"lon":5.45629}]

When I use the Connect IQ simulator, I use the menu with "Simulation" & "Phone app message", and I paste my json objet. All is OK, it work very well, and I can work with my data.

But when I use the app on my watch, when I send a message with my Android app, the watch app crash immediatly.
I have tried to do nothing with the message, it's the same :

function onPhone(msg) {
}

Of course it's the same if I put 

var data = msg.data;

Or if I put 

cancelAllRequests() ;

My watch app is crashing immediatly

I have, of course put the instructions

if (Communications has :registerForPhoneAppMessages) {
Communications.registerForPhoneAppMessages(self.method(:onPhone));
} else if (Communications has :setMailboxListener) {
Communications.setMailboxListener(self.method(:onMail));
}

In my initialize() function before.

Some help would be welcome, perhapas have forget something ?

Thank you