baxter_pykdl only shows 5 joints instead of 7

edit

  rospy.init_node('baxter_kinematics')
  print '*** Baxter PyKDL Kinematics ***\n'
  kin = baxter_kinematics('right')

gives me this message Unknown tag: materialScalar element defined multiple times: collisionScalar element defined multiple times: collisionUnknown tag: materialScalar element defined multiple times: collisionScalar element defined multiple times: collision

On doing kin._joint_names My output is ['left_s0', 'left_s1', 'left_e0', 'left_e1', 'left_w0']

Why am I not getting 7 joints instead of 5 joints?