DialogflowResult msg not recognised by rqt

[Luke1962]

Great Module.
I successfully installed the module on Ubuntu 18.04 with ros melody with
catkin_make install -DCATKIN_WHITELIST_PACKAGES="dialogflow_ros"

Interface with dialogflow is ok. and node is working
However when I run rqt , inside Topic monitor window, in corrispondence with "/dialogflow_client/results",in the column "Value", instead of 'not monitored' , I see
"can not get message class for thpe "dialogflow_ros/DialogflowResults"

Any suggestion?
p.s. package.xml and CMakeLists.txt have not been modified.

[piraka9011]

"can not get message class for type "dialogflow_ros/DialogflowResults"

This issue occurs when a package (in this case RQt) does not know where to find certain message types.
You should be running RQt in a terminal where the workspace you used to build dialogflow_ros is sourced.
That way, RQT can find the DialogflowResults message type and display it.

[Luke1962]

Hi,
I' know the need for sourcing.
I put both

source      /opt/ros/melodic/setup.bash
source      /home/luca/ros/devel/setup.bash

inside .bashrc , so they are run in every terminal

I've also rebuilt all nodes with catkin_make, but I get the same message.
May be is something related to the fact that I run the node under Python3 while rqt is under Python2?
This is the message I get when I launch rqt

luca@ENVY:~/ros$ rqt
/usr/local/lib/python3.6/dist-packages/pkg_resources/py2_warn.py:22: UserWarning: Setuptools will stop working on Python 2
************************************************************
You are running Setuptools on Python 2, which is no longer
supported and
>>> SETUPTOOLS WILL STOP WORKING <<<
in a subsequent release (no sooner than 2020-04-20).
Please ensure you are installing
Setuptools using pip 9.x or later or pin to `setuptools<45`
in your environment.
If you have done those things and are still encountering
this message, please comment in
https://github.com/pypa/setuptools/issues/1458
about the steps that led to this unsupported combination.
************************************************************
  sys.version_info < (3,) and warnings.warn(pre + "*" * 60 + msg + "*" * 60)
TopicInfo.__init__(): topic "/dialogflow_client/results": can not get message class for type "dialogflow_ros/DialogflowResult"

I cannot imagine what I could have been missed...