It seems that you have updated the Niryo ROS packages from github. When you do that, you also need to recompile the code. (a tutorial will be released soon on how to do that).
First, stop the current ROS execution (takes a lot of RAM) : sudo systemctl stop niryo_one_ros.service
Then : cd ~/catkin_ws
And : catkin_make -j2
Finally, you can restart the ROS code (sudo systemctl start niryo_one_ros.service)
Let me know if you still have the problem after doing that