I get errors including "apache config test fails, aborting" when trying to create a subdomain. What do I do?

Question

I just made a change to the httpd.conf file. The reason I did this is I'm trying to set up a subdomain. I now would like to restart apache2, but when I try to restart I run into a slew of errors. Specifically I added the changes that are found here https://stackoverflow.com/questions/4203580/creating-subdomains-in-amazon-ec2 to the httpd.conf file

<VirtualHost *:80>
  ServerName subdomain.example.com
  ServerAdmin [email protected]

  DocumentRoot /var/www/example.com/subdomain

  <Directory /var/www/example.com/subdomain>
    Options Indexes FollowSymLinks MultiViews
    AllowOverride All
    Order allow,deny
    allow from all
  </Directory>

  ErrorLog /var/log/apache2/subdomain.example.com.error.log
  LogLevel warn
  CustomLog /var/log/apache2/subdomain.example.com.access.log combined
</VirtualHost>

but when I try to restart apache I get the following errors.

AH00112: Warning: DocumentRoot [/var/www/xxx.com/subdomain] does not exist
(2)No such file or directory: AH02291: Cannot access directory '/var/log/apache2/' for error log of vhost defined at /xxx/xxx/apache2/conf/httpd.conf:193
AH00014: Configuration check failed
apache config test fails, aborting
AH00112: Warning: DocumentRoot [/var/www/xxxcom/subdomain] does not exist
(2)No such file or directory: AH02291: Cannot access directory '/var/log/apache2/' for error log of vhost defined at /opt/bitnami/apache2/conf/httpd.conf:193
AH00014: Configuration check failed
apache config test fails, aborting

so lets break down these errors

1. AH00112: Warning: DocumentRoot [/var/www/xxx.com/subdomain] does not exist (2)No such file or directory: to fix this do I add a file /var/www/xxx.com/subdomain if so should it be empty or have stuff in
   it. If it should have stuff in there what type of stuff?

2. AH02291: Cannot access directory '/var/log/apache2/' for error log of vhost defined at
/xxx/xxx/apache2/conf/httpd.conf:193 I don't know what this means or what to do about it.

3. AH00014: Configuration check failed apache config test fails, aborting I'm not sure what to do here either.

4. AH02291: Cannot access directory '/var/log/apache2/' for error log of vhost defined at /xxx/xxx/apache2/conf/httpd.conf:193 Do I do the same thing ans error AH00112

Solution

Make sure the directories that are missing are created. These directories should have appropriate permissions as well. Usually 755 permissions are sufficient.

Exmaple as below.

mkdir /var/www/example.com/subdomain
mkdir /var/log/apache2

Replace example.com and subdomain with actual directory names.