Unresolved refference "sensor_msgs", while making a script for subscribing to IMU data.

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I am trying to write a subscriber node to subscribe to IMU data and created a package for the same. My package has the sensor_mags dependencies. Here is my package.xml

  <buildtool_depend>catkin</buildtool_depend>
  <build_depend>roscpp</build_depend>
  <build_depend>rospy</build_depend>
  <build_depend>sensor_msgs</build_depend>
  <build_depend>std_msgs</build_depend>
  <build_export_depend>roscpp</build_export_depend>
  <build_export_depend>rospy</build_export_depend>
  <build_export_depend>sensor_msgs</build_export_depend>
  <build_export_depend>std_msgs</build_export_depend>
  <exec_depend>roscpp</exec_depend>
  <exec_depend>rospy</exec_depend>
  <exec_depend>sensor_msgs</exec_depend>
  <exec_depend>std_msgs</exec_depend>

However, when I write the import statements, I get this error:

Import statement:

import rospy
from std_msgs.msg import String
from sensor_msgs.msg import Imu

Error:

Unresolved reference 'sensor_msgs'
Unresolved reference 'Imu'

I am using pycharm and I had similar issues with rospy however I can't remember how I resolved it.

And also when I run the same code in my terminal after running python 3, I do not get any error.