localhost WampServer home page warnings and errors (1 reply)

I'm asking for your help not only because of the errors on the localhost WampServer home page (see below), but also because in the Your Projects section there is a warning notice.

Further, from Your Projects, all project links lead to either the front page for the project concerned or to a directory list, except one - xyz. This returns
Not Found
The requested URL /xyz/xxyz.htm was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Apache/2.4.33 (Win64) PHP/7.1.16 Server at localhost Port 80

Firstly, I can go to all pages of the project xyz via [localserver] with no problems.
Secondly, the root/home page for xyz is /index.htm, not /xyz/xxyz.htm. That is a page in a subsidary folder to the site root.

Please would you advise me as to what I have done wrong and how to correct the various problems?

(Please be aware that the WampServer installation was done by someone knowledgeable Of WAMP who is no longer available. I am relying on trying to understand and follow advice etc from WampServer help pages and elsewhere on the net.)
***

Windows 10 64-bit
Wampserver 3.1.3 64-bit
Apache 2.4.33
PHP 7.1.16
MySQL 5.7.21
MariaDB 10.2.14

HOSTS active lines:

	127.0.0.1 localhost
	127.0.0.1 localserver
	127.0.0.1 frontpage
	127.0.0.1 joomla-xy joomla.localhost

	::1 localhost
	::1 localserver
	::1 frontpage
	::1 joomla-xy joomla.localhost

WAMP icon is green.

I have access to localhost.
localhost (Homepage WampServer) error message:
[in red, error] Port :8083 used for the VirtualHost is not an Apache define variable

[in blue, warning] It's a bad idea to add localhost in the url of launching
projects. It is best to define VirtualHost in
wamp/bin/apache/apache2.4.33/conf/extra/httpd-vhosts.conf
file and not add localhost in the url.

I can access PHPMyAdmin.

Antivirus: F-Secure SAFE.
Firewall: Windows Defender

Installation full path: c:/wamp64

Virtual Hosts:
Below is the contents of httpd-vhosts.conf.

	<VirtualHost *:80>
	  ServerName localhost
	  ServerAlias localhost
	  DocumentRoot "${INSTALL_DIR}/www"
	  <Directory "${INSTALL_DIR}/www/">
		Options +Indexes +Includes +FollowSymLinks +MultiViews
		AllowOverride All
		Require local
	  </Directory>
	</VirtualHost>

	<VirtualHost *:8083>
	  ServerName localhost
	  ServerAlias localhost
	  DocumentRoot "${INSTALL_DIR}/www/xyz"
	  <Directory "${INSTALL_DIR}/www/xyz">
		Options +Indexes +Includes +FollowSymLinks +MultiViews
		AllowOverride All
		Require local
		Require ip 192.168.1
	  </Directory>
	</VirtualHost>

	<VirtualHost *:8084>
	  ServerName localhost
	  ServerAlias localhost
	  DocumentRoot "${INSTALL_DIR}/www/zyx"
	  <Directory "${INSTALL_DIR}/www/zyx">
		Options +Indexes +Includes +FollowSymLinks +MultiViews
		AllowOverride All
		Require local
		Require ip 192.168.1
	  </Directory>
	</VirtualHost>

	<VirtualHost *:8085>
	  ServerName localhost
	  ServerAlias localhost
	  DocumentRoot "${INSTALL_DIR}/www/frontpage"
	  <Directory "${INSTALL_DIR}/www/frontpage">
		Options +Indexes +Includes +FollowSymLinks +MultiViews
		AllowOverride All
		Require local
		Require ip 192.168.1
	  </Directory>
	</VirtualHost>

	<VirtualHost *:8086>
	  ServerName localhost
	  ServerAlias localhost
	  DocumentRoot "${INSTALL_DIR}/www/joomla-xy"
	  <Directory "${INSTALL_DIR}/www/joomla-xy">
		Options +Indexes +Includes +FollowSymLinks +MultiViews
		AllowOverride All
		Require local
		Require ip 192.168.1
	  </Directory>
	</VirtualHost>

also, from the WampServer localhost page:
Your VirtualHost
localhost
localhost:8083 - Not a Listen port
localhost:8084 - Not a Listen port
localhost:8085 - Not a Listen port
localhost:8086 - Not a Listen port
Error(s) See below