py-trees-tree-viewer for multiple robots

[nisan016]

Hi,
I'm working with multi-robot systems and have tried to run py-trees-tree-viewer for my robots under different namespaces. I was able to select the namespace in the "Namespace" box. However, when I select the other one (have two robots) I got the following error:

Exception in thread Thread-1 (spin): Traceback (most recent call last): File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner self.run() File "/usr/lib/python3.10/threading.py", line 953, in run self._target(*self._args, **self._kwargs) File "/opt/dependencies_ws/install/lib/python3.10/site-packages/py_trees_ros_viewer/backend.py", line 258, in spin self.connect(self.enqueued_connection_request_namespace) File "/opt/dependencies_ws/install/lib/python3.10/site-packages/py_trees_ros_viewer/backend.py", line 299, in connect console.logdebug("cancelling existing snapshot stream connection [{}][backend]".format(self.snapshot_stream_watcher)) AttributeError: 'Backend' object has no attribute 'snapshot_stream_watcher'. Did you mean: 'snapshot_stream_type'?

I am using Ubuntu 22.04 and ros2 humble (built py-trees-tree-viewer from source code from github). Have anyone else encountered the same problem?