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For the following error:
[ERROR] [1642350646.192738964]: Unable to connect to the database at 'localhost:33829'. If you just created the database, it could take a while for initial setup.
Likely cause is missing dependencies. Install the following:
sudo apt install mongodb-server-core
sudo apt install ros-noetic-warehouse-ros
# Not sure if the command below is needed...
sudo apt install ros-noetic-warehouse-ros-mongo
To verify mongod is working:
mongod -v
If the following error appears:
[ERROR] [1615567759.671633]: Mongo process exited with error code 100
That is because you have forgotten to kill your roslaunch panda_moveit_config demo.launch db:=true
The suggested solution comes from this thread: https://github.com/ros-planning/moveit/issues/123#issuecomment-797582356