Cannot use command rosdep
I followed the tutorial to learn ROS, but I meet some questions.When I using command
"$ rosdep install --from-paths src --ignore-src --rosdistro=kinetic -y"
,an error is coming. How to solve this issue?
"ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: robot_sim_demo: No definition of [yocs_cmd_vel_mux] for OS version [bionic] navigation_sim_demo: No definition of [dwa_local_planner] for OS version [bionic] slam_sim_demo: No definition of [hector_mapping] for OS version [bionic]"
I am using ubuntu 18.04 and ros melodic.