Erreur au lancementd'Apache : Invalid command 'SSLRequireSSL'

Bonjour

j'ai ce fichier de configuration

Code:

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<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteLogLevel 0 
  RewriteCond Host: (.*)
  RewriteRule ^/$ https\://%{HTTP_HOST}/ossim/ [R]
</IfModule>
 
<IfModule mod_alias.c>
  Alias /ossim "/opt/ossim/www"
</IfModule>
 
<Directory /opt/ossim/www>
  <IfModule mod_php4.c>
    php_value include_path .:/opt/ossim/include/
  </IfModule>
  SSLRequireSSL
</Directory>
 
<Directory /var/www/phpgacl>
  AuthType Basic
  AuthName OSSIM
  AuthUserFile /var/www/ossim-users
  Require valid-user
  SSLRequireSSL
  AllowOverride None
</Directory>
 
master
testing
unstable
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lorsque je tape cette ligne

Code:

/etc/init.d/apache2 restart

la console affiche cette erreur

Code:

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Restarting web server: apache2Syntax error on line 16 of /etc/apache2/conf.d/ossim.conf:
Invalid command 'SSLRequireSSL', perhaps misspelled or defined by a module not included in the server configuration
 failed!

comment puis-je résoudre ceci ?
merci