Uploading ....With some changes to Timo's helpful answer and a little more search, I solved it finally as below:
chgrp apache /home/hosein/www
chmod 777 /home/hosein/wwwsudo adduser <username> www-data
sudo usermod -a -G <username> www-data
sudo chown :www-data /var/www -R
sudo chmod g+rwX /var/www -R
sudo chmod g+s /var/www
Then re-login and now it's working!
<VirtualHost testproject:80>
# The ServerName directive sets the request scheme, hostname and port that
# the server uses to identify itself. This is used when creating
# redirection URLs. In the context of virtual hosts, the ServerName
# specifies what hostname must appear in the request's Host: header to
# match this virtual host. For the default virtual host (this file) this
# value is not decisive as it is used as a last resort host regardless.
# However, you must set it for any further virtual host explicitly.
#ServerName www.example.com
ServerAdmin webmaster@localhost
DocumentRoot /home/hosein/workspace/testproject/
<Directory />
Options Indexes FollowSymLinks Includes ExecCGI
AllowOverride All
Require all granted
Allow from all
</Directory>
# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
#Include conf-available/serve-cgi-bin.conf
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
also add /etc/hosts what you want like testproject