Hi all I’m new to this,
I’m currently using ros melodic with raspbian buster on a Pi4 4gb i have tried to change the python path and reinstall the rospkg but still this error.
Please help me 
from roslib.launcher import load_manifest
File “/opt/ros/melodic/lib/python2.7/dist-packages/roslib/launcher.py”, line 42, in
import rospkg
ModuleNotFoundError: No module named ‘rospkg’
make[2]: *** [ros_astra_camera/CMakeFiles/astra_camera_gencfg.dir/build.make:66: /home/pi/catkin_ws/devel/include/astra_camera/AstraConfig.h] Error 1
make[1]: *** [CMakeFiles/Makefile2:3453: ros_astra_camera/CMakeFiles/astra_camera_gencfg.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs…
[ 0%] Built target sensor_msgs_generate_messages_cpp
[ 0%] Built target rosgraph_msgs_generate_messages_nodejs
[ 0%] Built target std_msgs_generate_messages_eus
make: *** [Makefile:141: all] Error 2
Invoking “make -j4 -l4” failed