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ok, I had serveral problems. here are some tips to get around the error:

  1. execute catkin_make in root of catkin workspace
  2. add following code to your ~/.bash.rc source your/workspace/path/catkin/devel/setup.bash
  3. restart all terminals
  4. start roscore in a seperate terminal
  5. rosrun your node

for now it works. thanks to all helpers.