add_message_files() directory not found in hector messages

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Hi

I was trying to build custom message in hector_quadrotor package. For some reason, I cannot catkin_make the packages. Modified packages are all removed and it still cannot solve errors. Enter catkin_make, it shows:

> CMake Error at
> /opt/ros/indigo/share/genmsg/cmake/genmsg-extras.cmake:91
> (message):   add_message_files()
> directory not found: 
> /home/xiaohao/hector_quadrotor_tutorial/src/msg
> Call Stack (most recent call first):  
> CMakeLists.txt:23 (add_message_files)

"CMakeLists.txt" is changed back to original version as below,

cmake_minimum_required(VERSION 2.8.3)
project(hector_uav_msgs)
find_package(catkin REQUIRED message_generation std_msgs)
add_message_files(
  FILES
  Altimeter.msg
  AttitudeCommand.msg
  Compass.msg
  ControllerState.msg
  HeadingCommand.msg
  HeightCommand.msg
  MotorCommand.msg
  MotorPWM.msg
  MotorStatus.msg
  PositionXYCommand.msg
  RawImu.msg
  RawMagnetic.msg
  RawRC.msg
  RC.msg
  RuddersCommand.msg
  ServoCommand.msg
  Supply.msg
  ThrustCommand.msg
  VelocityXYCommand.msg
  VelocityZCommand.msg
  YawrateCommand.msg
)
generate_messages(
  DEPENDENCIES
  std_msgs
)
catkin_package(
  INCLUDE_DIRS include
#  LIBRARIES hector_uav_msgs
  CATKIN_DEPENDS message_runtime std_msgs
#  DEPENDS system_lib
)
install(DIRECTORY include/${PROJECT_NAME}/
  DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
  FILES_MATCHING PATTERN "*.h"
  PATTERN ".svn" EXCLUDE
)

Any advice on how to solve this error? Thanks