ROSRUN can't find EXECUTABLE

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Hello, I am using kinetic and I am trying to run a simple publisher and subscriber.

the cmakelists.xml has the following code.

cmake_minimum_required(VERSION 2.8.3)
project(mastering_ros_demo_pkg)

cmake_policy(SET CMP0046 OLD)

find_package(catkin REQUIRED COMPONENTS
  actionlib
  actionlib_msgs
  roscpp
  std_msgs
)


include_directories(
 include
  ${catkin_INCLUDE_DIRS}
)



add_executable(demo_topic_publisher src/demo_topic_publisher.cpp) 
add_executable(demo_topic_subscriber src/demo_topic_subscriber.cpp)


add_dependencies(demo_topic_publisher ${mastering_ros_demo_pkg}_gencfg)
add_dependencies(demo_topic_subscriber ${mastering_ros_demo_pkg}_gencfg)


target_link_libraries(demo_topic_publisher ${catkin_LIBRARIES}) 
target_link_libraries(demo_topic_subscriber ${catkin_LIBRARIES})

after running rosrun i get the following error :

[rosrun] Couldn't find executable named demo_topic_publisher below /home/xavier/catkin_ws/src/mastering_ros_demo_pkg

I did source the setup.bash after catkin_make but still the issue was not sovled.

Please help me out here.