error while" catkin_make common_msgs"

edit

i'm try to install the package : common_msgs.use wstool and catkin

i use catkin_make to make it,there is some wrong:

-- ==> add_subdirectory(common_msgs/sensor_msgs)
-- sensor_msgs: 26 messages, 1 services
CMake Error at /home/shuixiu/catkin_ws/build/common_msgs/sensor_msgs/cmake/sensor_msgs-genmsg.cmake:191 (add_custom_target):
  add_custom_target cannot create target "sensor_msgs_generate_messages_cpp"
  because another target with the same name already exists.  The existing
  target is a custom target created in source directory
  "/home/shuixiu/catkin_ws/src/nao_robot/nao_description".  See documentation
  for policy CMP0002 for more details.
Call Stack (most recent call first):
  /opt/ros/hydro/share/genmsg/cmake/genmsg-extras.cmake:288 (include)
  common_msgs/sensor_msgs/CMakeLists.txt:47 (generate_messages)


CMake Error at /home/shuixiu/catkin_ws/build/common_msgs/sensor_msgs/cmake/sensor_msgs-genmsg.cmake:376 (add_custom_target):
  add_custom_target cannot create target "sensor_msgs_generate_messages_lisp"
  because another target with the same name already exists.  The existing
  target is a custom target created in source directory
  "/home/shuixiu/catkin_ws/src/nao_robot/nao_description".  See documentation
  for policy CMP0002 for more details.
Call Stack (most recent call first):
  /opt/ros/hydro/share/genmsg/cmake/genmsg-extras.cmake:288 (include)
  common_msgs/sensor_msgs/CMakeLists.txt:47 (generate_messages)


CMake Error at /home/shuixiu/catkin_ws/build/common_msgs/sensor_msgs/cmake/sensor_msgs-genmsg.cmake:561 (add_custom_target):
  add_custom_target cannot create target "sensor_msgs_generate_messages_py"
  because another target with the same name already exists.  The existing
  target is a custom target created in source directory
  "/home/shuixiu/catkin_ws/src/nao_robot/nao_description".  See documentation
  for policy CMP0002 for more details.
Call Stack (most recent call first):
  /opt/ros/hydro/share/genmsg/cmake/genmsg-extras.cmake:288 (include)
  common_msgs/sensor_msgs/CMakeLists.txt:47 (generate_messages)

if you know why,plz tell me,thank u