Error when executing move_robot.py

[vrontos]

Hello,

I followed all the installation steps and i do the following:

1st shell: $ roslaunch panda_gazebo panda_world.launch
2nd shell: cd ~/catkin_ws/src/panda_simulator/panda_simulator_examples/scripts and $ python move_robot.py.

I get the following error:

Traceback (most recent call last):
  File "move_robot.py", line 4, in <module>
    from franka_core_msgs.msg import JointCommand, RobotState
ImportError: No module named franka_core_msgs.msg 

P.S.
At the beginning i was getting an error when launching the panda_world.launch:
[ERROR] [1585070496.558123479, 0.613000000]: Could not load controller 'panda_simulator/joint_state_controller' because controller type 'joint_state_controller/JointStateController' does not exist.
now it works because i did the following (is it wrong?): sudo apt-get install ros-melodic-joint-state-controller
Thanks

[justagist]

It looks like you haven't built the frank_ros_interface package correctly, or is not sourced. The franka_core_msgs package should automatically be installed if you built franka_ros_interface. Try rebuilding your catkin workspace after making sure that franka_ros_interface is present in your src folder along with all other dependent packages (listed in README).
Yes, the joint-state-controller package should be installed as well.

[TracyLestrade]

yes,he is right. when u open new terminal. before run python script. do this.
source devel/setup.bash