Why there is no map frame in rviz. #5
Description
I'm following the instruction of your YouTube video. I'm using ROS Noetic and Ubuntu 20.04 LTS. I run these two commands in two separate terminals:
roslaunch differential_drive_robot_description gazebo.launch
roslaunch navigation navigation.launch
However, there is no an option called map in the drow-down list of the Fixed Frame under the Global Options section. The available choices here include base_link, caster_1, and lidar_1. This causes errors in the status of RobotModel and Map.
In addition, there is no option I can choose in the drow-down lost of the Topic of LaserScan. I aslo found that the two wheels of robot didn't display correctly.
Can you kindly guide me through these issues? I attached a screenshot. Thanks.
