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Why is Python rosbag crashing?

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I'm trying to read a ROS bag file to convert it's values. I'm using the rosbag Python API. I don't understand why the reading crashes at the end: -0.262920607691 0.447809595374 -0.39638550589 -3.14159265357 0.726601225435 -2.87867204592 -0.265034838048 0.436386356356 -0.412905936714 -3.14159265357 0.721504033644 -2.87655781556 Traceback (most recent call last): File "rosbag_read_write.py", line 20, in for topic, msg, t in bag.read_messages(topics=['/joint_states']): File "/opt/ros/indigo/lib/python2.7/dist-packages/rosbag/bag.py", line 2329, in read_messages yield self.seek_and_read_message_data_record((entry.chunk_pos, entry.offset), raw) File "/opt/ros/indigo/lib/python2.7/dist-packages/rosbag/bag.py", line 2459, in seek_and_read_message_data_record raise ROSBagFormatException('Expecting OP_MSG_DATA, got %d' % op) rosbag.bag.ROSBagFormatException: Expecting OP_MSG_DATA, got 6 Here is my script: import sys import rosbag from ttk import * from Tkinter import Tk from tkFileDialog import askopenfilename from tkFileDialog import asksaveasfile Tk().withdraw() # we don't want a full GUI, so keep the root window from appearing filename = askopenfilename(filetypes = ( ("ROS bag", "*.bag"),("All files", "*.*") ) ) print(filename) bag = rosbag.Bag(filename) topics = bag.get_type_and_topic_info()[1].keys() types = [] for i in range(0,len(bag.get_type_and_topic_info()[1].values())): types.append(bag.get_type_and_topic_info()[1].values()[i][0]) print types for topic, msg, t in bag.read_messages(topics=['/joint_states']): print msg.position[0], msg.position[1], msg.position[2], msg.position[3], msg.position[4], msg.position[5] bag.close() The bag file is [available here]( https://mega.nz/#!lEVjnAKZ!MBRLR6l32m4t6HUgUinUD9u2yfdh9X0hn3pNog8u1SY).

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