At least twice previously, how about the idea of copy all the missing file contents and inserting directly into autoload.php. Then we know the code is included. May there a reason why that can not been done? I tried once something was wrong can you make it work?
Its 1030pm here. I waited all day. Going to sleep time zones are hopeless.
Reloaded still fails. The other option caught in namespace issues only one allowed i autoload.php edited
ted file.
I have solved the problem.
I was in hospital May to August so in rehab I relooked at this issue. Its caused by the core-interfaces-php sub directory used in the example autoload.php does not exist. Its actually the core-interfaces name only. We were mislead when getting the autoload.php download from the official site. The pictures of directories above clearly show that the name of the location of the files in question did not use core-intefaces-php.
Glad your okay, and thank you for sharing your findings! 