I have been trying to develop a custom control plugin as a part of my academic project. I am quite new to ROS. I am writing the plugin in python interpreter using Pycharm IDE. While trying to import jointstatelistener, I have been having unresolved reference. The syntax I am using exactly is

from jointstateslistener.srv import *

I have been having the same error while importing osrf_msgs.msg and the syntax for it as follows,

from osrf_msgs.msg import JointCommand

can anyone please help me point out where I am doing wrong ? Thanks in advance

edit:

the sample code where I am trying to import joint_states-listener is

    import roslib
    roslib.load_manifest('joint_states_listener')
   from joint_states_listener.srv import *
   from joint_States_listener.srv import ReturnJointStates

   def return_joint_states(self, req):
    joints_found = []
    positions = []
    velocities = []
    efforts = []
    for joint_name in req.name:
        (found, position, velocity, effort)=self.return_joint_state(joint_name)
        joints_found.append(found)
        positions.append(position)
        velocities.append(velocity)
        efforts.append(effort)
    return ReturnJointStatesResponse(joints_found, positions, velocities, efforts)

Here is the error ,

Traceback (most recent call last):
File "/home/microbot/catkin_ws/src/spider/spider_control/control.py", line 16, in <module>
from joint_states_listener.srv import *
ModuleNotFoundError: No module named 'joint_states_listener'