The warning states PIP version, I used zipped version and generate project as-is from jucer file.
Using the tutorial code with getCurrentWorkingDirectory() I had to copy the resource folder to hard-disk root directory to get it working.
To locate the file in project folder, changing line 91: auto dir = File::getCurrentWorkingDirectory();
to auto dir = File::getSpecialLocation (File::SpecialLocationType::currentApplicationFile);
solved the problem for me.
These two threads also confirm what I found with getCurrentWorkingDirectory() on Mac.