can't locate node in package

edit

HI everybody, I am having problems in building a large project. I'am trying to add some modularity to my .launch file. I built my launch file as follows

<launch>
 <include file="$(find gazebo_ros)/launch/empty_world.launch">
   <arg name="world_name" value="$(find vtol_gazebo)/worlds/vtol.world"/>
  </include>


    <include file="$(find heterogeneous)/config/heterogeneous.xml"/>

</launch>

with the file included being

<launch>

  <node pkg="heterogeneous" name="het" type="heterogeneous">  
  </node>

</launch>

the node in the heterogeneous package is (successfully) built with the following CMakeLists.txt file

cmake_minimum_required(VERSION 2.8.3)
project(heterogeneous)

find_package(catkin REQUIRED COMPONENTS
  roscpp
)

set(ARMADILLO_INCLUDE /usr/local/include/)
set(ARMADILLO_LIBRARIES /usr/lib/libarmadillo.so)

include_directories(include/${PROJECT_NAME} ${Boost_INCLUDE_DIR} ${catkin_INCLUDE_DIRS} )

add_executable(heterogeneous src/Heterogeneous.cpp)
target_link_libraries(${PROJECT_NAME} ${catkin_LIBRARIES} )

catkin_package(
  DEPENDS
    roscpp
)

The file si successfully compiled and the executable added to the project workspace. In fact, if I prompt from the catkin workspace

find -executable -name heterogeneous -type f

I obtain

./build/heterogeneous/heterogeneous

However when I launch the .launch file I get

ERROR: cannot launch node of type [heterogeneous/heterogeneous]: can't locate node [heterogeneous] in package [heterogeneous]

I really cannot figure out what the problem is. I am using ros hydro Any ideas? Thanks Andrea

EDIT: actually I cannot run the node with

rosrun heterogeneous heterogeneous