Missing 'logs below' during start of a Node.js app in Micro CloudFoundry

I have locally a instance of Micro Cloud Foundry. I deploy a node.js app who failed to start.

Every things seems to be ok. Vm player and micro cloudfoundry are ok. I connect with vmc to my instance.

I create (or share) 2 services : a redis and a mongoDB. That I link to this app.

And when I start (or update), i had an Error.

This error should be show me some logs. ('below') but it doesn't.

An Idea about that ? Thanks

(the standard answer (according from google) is /logs/sterr.log or other. But I haven't.

Moreover, Where is the /logs/ directory ?

toto@toto:~/apps/myapp$ vmc update myapp
Uploading Application:
  Checking for available resources: OK
  Processing resources: OK
  Packing application: OK
  Uploading (7K): OK   
Push Status: OK
Stopping Application 'myapp': OK
Staging Application 'myapp': OK                                            
Starting Application 'myapp': .
Error: Application [myapp] failed to start, logs information below.
toto@toto:~/apps/myapp$