Rviz terminal print the error problems of QObject::connect

[qisongH]

I use the PointClound2 plug-in to subscribe point cloud data. The data is displayed normally, but the terminal prints the following error information:

Your environment

• OS Version: e.g. Ubuntu 18.04
• ROS Distro: Melodic
• RViz, Qt, OGRE, OpenGl version as printed by rviz:

  [ INFO] [1646653665.369882000]: rviz version 1.13.23
  [ INFO] [1646653665.369933300]: compiled against Qt version 5.9.5
  [ INFO] [1646653665.369944800]: compiled against OGRE version 1.9.0 (Ghadamon)
  [ INFO] [1646653665.373622300]: Forcing OpenGl version 0.
  [ INFO] [1646653665.491788300]: Stereo is NOT SUPPORTED
  [ INFO] [1646653665.492296300]: OpenGL device: llvmpipe (LLVM 10.0.0, 256 bits)
  [ INFO] [1646653665.492382900]: OpenGl version: 3.1 (GLSL 1.4).
  

[rhaschke]

I have seen this warning from time to time as well. As it doesn't harm, and because I couldn't find the culprit immediately (rviz doesn't mention QVector<int>), I decided to ignore the warning. If you want to debug deeper, you are welcome to do so 😉

[rhaschke]

I wasn't able to reproduce this issue with a PC2 display. Please provide more detailed instructions to reproduce the problem.