hello, I am created "record_odom.action, I tested with “rosmsg list | grep record_odom”. I think that oke however when i import it in project and run then i got this error. please help me how to solve this error.
Did you run source devel/setup.bash after running catkin_make(from the catkin_ws directory)?
yes i have run source devel/setup.bash
@TrnDuyNht
When I checked your code and ran source devel/setup.bash, the error disappeared 
user:~/catkin_ws$ source devel/setup.bash
user:~/catkin_ws$ rosrun my_turtlebot_topics record_odom_action_server.py
# no output
^Cuser:~/catkin_ws$ rosrun my_turtlebot_topics record_odom_action_client.py
[INFO] [1603707750.954718, 2752.046000]: Waiting for action Server