In the Unit 8 Understanding the ROS Actions - Clients ----> 8.9 The axclient. There is no file which exists in this folder.
user:/opt/ros/noetic/share/actionlib$ ls
action cmake msg package.xml
user:/opt/ros/noetic/share/actionlib$ cd action
user:/opt/ros/noetic/share/actionlib/action$ ls
Test.action TestRequest.action TwoInts.action
user:/opt/ros/noetic/share/actionlib/action$ cd ..
user:/opt/ros/noetic/share/actionlib$ ls
action cmake msg package.xml
user:/opt/ros/noetic/share/actionlib$
Please uplaod this file for the future reference. Thanks!!
Otherwise the following error will be keep poping up.