ImportError: No module named msg

[AKRNANDULA]

While i am launching roslaunch my_dynamixel_tutorial controller_manager.launch i am getting this error. It works fine till yesterday & i controlled dynamixel motors with my algorithm. But all of sudden it appears today after i run catkin_make

F File "/home/adirosgaz/catkin_ws/src/dynamixel_motor/dynamixel_controllers/nodes/controller_manager.py", line 52, in from dynamixel_driver.dynamixel_serial_proxy import SerialProxy File "/home/adirosgaz/catkin_ws/src/dynamixel_motor/dynamixel_driver/src/dynamixel_driver/dynamixel_serial_proxy.py", line 63, in from dynamixel_msgs.msg import MotorState ImportError: No module named msg