Apache can't find the files in /~user/Sites

Macbook Air (Early 2014) | OS X El Capitan version 10.11.5
Server version: Apache/2.4.18 (Unix) | Server built: Feb 20 2016 20:03:19

I'm following a PHP course and have MAMP installed. A year ago it all works correctly. Now I started again and when I try to load the files in /user/Sites I get the following message:

The requested URL /~user/Sites/index.html was not found on this server.

Localhost is working correctly, I get the message: It Works!

I think the trouble is caused by updates. I googled around and followed some tutorials to fix the problems. All I did was unIdea some lines in htppd.conf, httpd-userdir.conf and in user.conf. After that the problem still exist.

When I puts apachectl configtest I got the following results:

AH00557: httpd: apr_sockaddr_info_get() failed for customer.provider.com

AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message
Syntax OK

I fixed this problems by adding the line ServerName Localhost in httpd.conf. When I puts apachectl configtest again I get the message:

Syntax OK

What can be wrong that Apache can't find the files in /~user/Sites?

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