ojs2 has produced an error
  Message: WARNING: assert(): Assertion failed
  In file: /home/chov/public_html/proceeding.unindra.ac.id/classes/issue/IssueDAO.inc.php
  At line: 100
  Stacktrace: 
  Server info:
   OS: Linux
   PHP Version: 5.6.40
   Apache Version: N/A
   DB Driver: mysql
   DB server version: 8.0.45<br/>
ojs2 has produced an error
  Message: WARNING: Cannot modify header information - headers already sent by (output started at /home/chov/public_html/proceeding.unindra.ac.id/lib/pkp/classes/core/PKPApplication.inc.php:381)
  In file: /home/chov/public_html/proceeding.unindra.ac.id/lib/pkp/classes/core/PKPRequest.inc.php
  At line: 87
  Stacktrace: 
  Server info:
   OS: Linux
   PHP Version: 5.6.40
   Apache Version: N/A
   DB Driver: mysql
   DB server version: 8.0.45<br/>