On apache 2.4.25-3 + deb9u4 (obviously Debian), the line mentioned by @Mr Roshan Pawar does not exist. You must create a symbolic link pointing to the module and including it in /etc/apache2/mods-enabled as follows:
ln -s../mods-available/socache_shmcb.load socache_shmcb.load
As @ericP said, you need to restart your Apache, depending on your distribution / configuration it might be:
service apache2 restart /etc/init.d/apache2 restart systemctl restart apache2 apache2 -k restart
Miguel Ortiz Jul 31 '18 at 13:59 2018-07-31 13:59
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