Exporting to C++ Juiceaid not working?

Hello everyone. I'm not a programmer. Just started with RNBO. I am trying to export a device I made. I could export it succesfully to an external. So the sourcecode is fine. But I'm struggling to export it to C++ to build a GUI in Juice later.

I followed all steps in the guide on GitHub. But I just won't succeed at the cmake .. part. When I enter that command, I get a long red list.

at the beginning I get

CMake Error at thirdparty/juce/extras/Build/juceaide/CMakeLists.txt:141 (message):
  Failed to build juceaide

then I get a lot of warnings and at the end it says:

15 warnings and 1 error generated.

  gmake[2]: ***
  [extras/Build/juceaide/CMakeFiles/juceaide.dir/build.make:107:
  extras/Build/juceaide/CMakeFiles/juceaide.dir/__/__/__/modules/juce_gui_basics/juce_gui_basics.mm.o]
  Error 1

  gmake[1]: *** [CMakeFiles/Makefile2:183:
  extras/Build/juceaide/CMakeFiles/juceaide.dir/all] Error 2

  gmake: *** [Makefile:136: all] Error 2

I've been at it for a couple of hours now. No success. Is there a tutorial somewhere that takes me through all the steps one by one? Or is there something I can do to check what is wrong?