winros find_package(catkin) failure

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Hi,
when I try to compile an overlay workspace with winros_make I get the following error:

loading initial cache file C:\work\overlay\config.cmake
CMake Error at CMakeLists.txt:47 (message):
  find_package(catkin) failed.  catkin was neither found in the workspace nor
  in the CMAKE_PREFIX_PATH.  One reason may be that no ROS setup.sh was
  sourced before.

I don't know what I should do, because I previously called the setup.sh in C:\work\ws\devel which is the directory I have my self compiled windros SDK.

Can someone please help me?

UPDATE1
I also tried to add the following lines to both config.cmake and CMakeLists.txt in the root and src folder, respectively:

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "C:/work/ws/src/catkin/cmake")
set(CMAKE_PREFIX_PATH "${CMAKE_PREFIX_PATH};C:/work/ws/src/catkin/cmake")