Error in Fade.ino

DUE Board
I tried to import an simple Arduino File and I get the following message
D:/__Dokus/Documents/Arduino/01.Basics/01.Basics/Fade.ino: In function ‘void setup()’:
D:/__Dokus/Documents/Arduino/01.Basics/01.Basics/Fade.ino:27:6: error: redefinition of ‘void setup()’
// reverse the direction of the fading at the ends of the fade:

I figured out, that a INO Project is not working, if other ino files in the same folder

You can not build multiple “arduino-examples” as one project. That is not possible. Please use 1 example (that can consist from c/cpp/h files) for the project.