Bluez error

[Mark81]

Hi, I compiled Qt5.6 for RPi3 as described in several tutorial.
During compilation of QtConnectivity I saw the checking for bluez and bluez_le was successfully. In fact I have a working bluez5 and I can manage it from command line, also it replies to a dbus command.

But when I try to launch a BT example (i.e. the chat one) I got the error:

Cannot find a running Bluez. Please check the Bluez installation.

What should I do to fix this error?