Ojs - 3.3.0-7 - I can´t open scheduled tasks - Failed Ajax request or invalid JSON returned

I can’t open the scheduled task tool, it always gets stuck in the loading screen and shows the following error log shown below and followed by the following error code:

[Mon Nov 22 11:39:22.786114 2021] [php7:error] [pid 5034] [client 192.168.100.147:53047] PHP Fatal error: Uncaught Error: Call to a member function getLocalizedAcronym() on null in /var/www/html/ojs/cache/t_compile/7bdb22b1beb9ad34cdbc123fe840c756abbed6db^642608917fb21577c3f7235b556979f3e7c86b25_0.app.controllersgridtaskstask…php:32\nStack trace:\n#0 /var/www/html/ojs/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_619b80a9aed8f3_82173092()\n#1 /var/www/html/ojs/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode()\n#2 /var/www/html/ojs/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(216): Smarty_Template_Compiled->render()\n#3 /var/www/html/ojs/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(232): Smarty_Internal_Template->render()\n#4 /var/www/html/ojs/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(116): Smarty_Internal_TemplateBase->_execute()\n#5 /var/www/html/ojs/lib/pkp/classes/temp in /var/www/html/ojs/cache/t_compile/7bdb22b1beb9ad34cdbc123fe840c756abbed6db^642608917fb21577c3f7235b556979f3e7c86b25_0.app.controllersgridtaskstask…php on line 32, referer: http://10.10.1.49/ojs/index.php/index/admin

Screen do carregamento do tasks
screen do log de erro

Falied Ajax request or invalid JSON returned