I am following the official instruction on Nextclouds official webpage. I pasted in this text into /etc/php/7.0/apache2/php.ini :
opcache.enable=1
opcache.enable_cli=1
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
opcache.memory_consumption=128
opcache.save_comments=1
opcache.revalidate_freq=1
and I still got the error message. I use Ubuntu 16.04.3 and PHP7.
Thanks in advance.