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I followed guide at http://www.ros.org/doc/api/rosbag/html/c++/ when i run the code it tells me "ImportError: No module named rosbag" Traceback (most recent call last): File "/home/user/ros_workspace/beginner_tutorials/nodes/read_bag.py", line 4, in <module> import rosbag ImportError: No module named rosbag

please tell me how to fix this!

I followed guide at http://www.ros.org/doc/api/rosbag/html/c++/ when i run the code it tells me "ImportError: No module named rosbag" rosbag"

Traceback (most recent call last): File "/home/user/ros_workspace/beginner_tutorials/nodes/read_bag.py", line 4, in <module> import rosbag ImportError: No module named rosbag

please tell me how to fix this!