I’m trying to upgrade from version 3.3.0.10 to 3.3.0.14. When I click on the update button I get the following error:
Fatal error : Uncaught Error: Call to a member function compare() on null in /var/www/html/lib/pkp/classes/install/Installer.inc.php:303 Stack trace: #0 /var/www/html/lib/pkp/classes/install/Installer.inc.php(237): Installer->parseInstallNodes() #1 /var/www/html/lib/pkp/classes/install/Installer.inc.php(171): Installer->parseInstaller() #2 /var/www/html/lib/pkp/classes/install/form/UpgradeForm.inc.php(43): Installer->execute() #3 /var/www/html/lib/pkp/pages/install/InstallHandler.inc.php(130): UpgradeForm->execute() #4 /var/www/html/lib/pkp/classes/core/PKPRouter.inc.php(395): InstallHandler->installUpgrade() #5 /var/www/html/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest() #6 /var/www/html/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route() #7 /var/www/html/lib/pkp/classes/core/PKPApplication.inc.php(362): Dispatcher->dispatch() #8 /var/www/html/index.php(68): PKPApplication->execute() #9 {main} thrown in /var/www/html/lib/pkp/classes/install/Installer.inc.php on line 303
I use php 7.4, debian 9, mysql 5.5
Thanks