@asmecher Dear DOI link is not working. It is generating but working. I am using OJS version 3.1.1.4. Screenshots are attached. Please check setting, is any issue in settings?
This is error messege in error log file
[23-Mar-2021 19:47:01 UTC] PHP Fatal error: Uncaught Error: Call to a member function getId() on null in /home/pjoorgpk/public_html/pages/issue/IssueHandler.inc.php:52
[29-Mar-2021 16:45:50 UTC] PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function PKPHandler::setupTemplate(), 0 passed in /home/pjoorgpk/public_html/pages/gateway/GatewayHandler.inc.php on line 26 and exactly 1 expected in /home/pjoorgpk/public_html/lib/pkp/classes/handler/PKPHandler.inc.php:433