403 error forbidden you don't have permission to access /myapp on this server mod_wsgi and apache - mod-wsgi

Question

I have installed mod_wsgi as an Apache module and I want to run a simple hello world application to see that the module works properly.
I have followed this guide, which is based on the official Quick Configuration Guide.
After completing all the steps I get a 403 error
Forbidden You don't have permission to access /myapp on this server..
I am using Apache/2.4.10 on Raspbian and my installed mod_wsgi version is
libapache2-mod-wsgi-py3 4.3.0-1 armhf Python 3 WSGI adapter module for Apache.
I have added example.com to my hosts' file as follows:
127.0.0.1 localhost example.com
I created the example.com.conf file in /etc/apache2/sites-enabled/ with contents:
<VirtualHost *:80>
ServerName www.example.com
ServerAlias example.com
ServerAdmin test#test.com
DocumentRoot /usr/local/www/documents
<Directory /usr/local/www/documents>
Order allow,deny
Allow from all
</Directory>
WSGIScriptAlias /myapp /usr/local/www/wsgi-scripts/myapp.wsgi
<Directory /usr/local/www/wsgi-scripts>
Order allow,deny
Allow from all
</Directory>
myapp.wsgi contents:
def application(environ, start_response):
status = '200 OK'
output = 'Hello World!\n'
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)
return [output]
and created the files/folders for the hello world application with the following permissions:
drwxr-sr-x 2 root www-data 4096 Feb 1 13:18 documents
drwxr-sr-x 2 root www-data 4096 Feb 1 13:22 wsgi-scripts
I also made sure that example.com is served locally and not through DNS with ping.
I cannot understand why my installation is not working.
Are any further configuration options missing or is there something wrong with any of my settings?

Answer 1

I figured it out after a few modifications.
The new example.com.conf file is:
<VirtualHost *:80>
ServerName www.example.com
ServerAlias example.com
DocumentRoot /usr/local/www/documents
<Directory /usr/local/www/documents>
Require all granted
Satisfy Any
</Directory>
WSGIScriptAlias /myapp /usr/local/www/wsgi-scripts/myapp.wsgi
<Directory /usr/local/www/wsgi-scripts>
<Files myapp.wsgi>
Require all granted
Satisfy Any
</Files>
</Directory>
After the syntax changed to match apache 2.4 I got 500 Internal Server Error, which upon further investigation inside apache error.log file indicated the following error:
[wsgi:error] [pid 11216] [client 127.0.0.1:56642] mod_wsgi (pid=11216): Exception occurred processing WSGI script '/usr/local/www/wsgi-scripts/myapp.wsgi'.
[wsgi:error] [pid 11216] [client 127.0.0.1:56642] TypeError: sequence of byte string values expected, value of type str found
To solve this error I changed the output variable assignment in myapp.wsgi file from output = 'Hello World!\n'
to output = b'Hello World!' as it is indicated here.