catkin_make error in indigo

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Hello everyone,

i've just started using ROS. i am trying to build a package and i keep getting the following error:

Traceback (most recent call last):
File "/opt/ros/indigo/share/catkin/cmake/order_paths.py", line 37, in <module>
main()
File "/opt/ros/indigo/share/catkin/cmake/order_paths.py", line 32, in main
with open(args.outfile, 'w') as fh:
IOError: [Errno 13] Permission denied: '/home/ssc044/catkin_ws/build/ati_nano17_ros/catkin_generated    /ordered_paths.cmake'
CMake Error at /opt/ros/indigo/share/catkin/cmake/safe_execute_process.cmake:11 (message):

execute_process(/home/ssc044/catkin_ws/build/catkin_generated/env_cached.sh
"/usr/bin/python" "/opt/ros/indigo/share/catkin/cmake/order_paths.py"
"/home/ssc044/catkin_ws/build/ati_nano17_ros/catkin_generated/ordered_paths.cmake"
"--paths-to-order" "/opt/ros/indigo/include" "/usr/include"
"/home/ssc044/catkin_ws/devel/include" "--prefixes"
"/home/ssc044/catkin_ws/devel" "/home/ssc044/catkin_ws/src"
"/home/ssc044/catkin_ws/devel" "/home/ssc044/catkin_ws/src"
"/home/ssc044/moveit_ws/devel" "/home/ssc044/moveit_ws/src"
"/opt/ros/indigo") returned error code 1
Call Stack (most recent call first):
/opt/ros/indigo/share/catkin/cmake/list_insert_in_workspace_order.cmake:29 (safe_execute_process)
/opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:99 (list_insert_in_workspace_order)
ati_nano17_ros/CMakeLists.txt:7 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/ssc044/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ssc044/catkin_ws/build/CMakeFiles/CMakeError.log".
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

I've tried different solutions from the internet but nothing worked.

Thank you in advance