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Unable to open rosbag files in C++

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Hello, I am trying to write a node to edit the timestamps in a bag file, using C++. The code I have written is attached below. I have tried to follow the template given in the rosbag C++ API, but I am unable to open any of the bag files I have, even though they run perfectly well when I play them back using rosbag play. Specifically, I am seeing the error message terminate called after throwing an instance of 'rosbag::BagIOException' what(): Error opening file: ~/catkin_ws/src/publish_text/launch/filtered.bag I am not quite sure why exactly this is happening. Would greatly appreciate it if anyone had any suggestions! Thanks. (Code from the main function of my code enclosed below) ros::init(argc, argv, "postprocessing"); ros::NodeHandle nh("~"); std::string instr, outstr; rosbag::Bag inbag, outbag; if (nh.getParam("input_path", instr)) { inbag.open(instr, rosbag::bagmode::Read); } else { ROS_ERROR("No input path provided, terminating\n"); exit(1); } if (!nh.getParam("output_path", outstr)) { outbag.open(outstr, rosbag::bagmode::Write); } else { ROS_ERROR("No output path provided, terminating\n"); exit(1); }

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