ocs2 has produced an error
  Message: USER ERROR: Smarty error: unable to write to $compile_dir '/var/www/ocs/cache/t_compile'. Be sure $compile_dir is writable by the web server user.
  In file: /var/www/ocs/lib/pkp/lib/smarty/Smarty.class.php
  At line: 1093
  Stacktrace: 
  Server info:
   OS: Linux
   PHP Version: 5.5.9-1ubuntu4.29
   Apache Version: Apache/2.4.7 (Ubuntu)
   DB Driver: mysql
   DB server version: 5.6.50<br/>
ocs2 has produced an error
  Message: WARNING: include(/var/www/ocs/cache/t_compile/%%02^029^029F1BCC%%authorIndex.tpl.php): failed to open stream: No such file or directory
  In file: /var/www/ocs/lib/pkp/lib/smarty/Smarty.class.php
  At line: 1256
  Stacktrace: 
  Server info:
   OS: Linux
   PHP Version: 5.5.9-1ubuntu4.29
   Apache Version: Apache/2.4.7 (Ubuntu)
   DB Driver: mysql
   DB server version: 5.6.50<br/>
ocs2 has produced an error
  Message: WARNING: include(): Failed opening '/var/www/ocs/cache/t_compile/%%02^029^029F1BCC%%authorIndex.tpl.php' for inclusion (include_path='.:/var/www/ocs/classes:/var/www/ocs/pages:/var/www/ocs/lib/pkp:/var/www/ocs/lib/pkp/includes:/var/www/ocs/lib/pkp/classes:/var/www/ocs/lib/pkp/pages:/var/www/ocs/lib/pkp/lib/adodb:/var/www/ocs/lib/pkp/lib/phputf8:/var/www/ocs/lib/pkp/lib/pqp/classes:/var/www/ocs/lib/pkp/lib/smarty:.:/usr/share/php:/usr/share/pear')
  In file: /var/www/ocs/lib/pkp/lib/smarty/Smarty.class.php
  At line: 1256
  Stacktrace: 
  Server info:
   OS: Linux
   PHP Version: 5.5.9-1ubuntu4.29
   Apache Version: Apache/2.4.7 (Ubuntu)
   DB Driver: mysql
   DB server version: 5.6.50<br/>