Current version of OJS 3.3.0.19 throws error and unable to edit/remove Dashboard contents

Describe the issue or problem
Several Warnings/Fatal errors are thrown since 30-Dec-2025 onwards while adding new Submissions vis Dashboard. Unable to edit User / Roles. Unable to Remove Dashboard content.

All these happening without any changes/upgrade made to OJS.

Steps I took leading up to the issue

  1. while Adding new Submissions vis Dashboard.
  2. While Adding/Editing Users and/or Roles.
  3. While Removing Dashboard content.

No actions allowed, almost all of them are blocked. (Clicvking “OK” in the pop-up, throws errors; ofcourse, “Cancel’ button closes the pop-up window.)

What application are you using?
Using OJS 3.3.0-19
Note:
#1) Initially used PHP 7.4 (When errors were thrown), and then upgraded to PHP 8.0 (15-Jan-2026) as suggested in the PKP forum, but still the errors persisted.

#2) I also tried to move to PHP 8.4 and rolled-back to PHP 8.1 by 26-Jan-2026.

#3) Currently, I upgraded to PHP 8.4

Additional information
Pls see the errors displayed

[u]While Loading the first page of the site: https://iqmrj.com/index.php/iqmrj/index[/u]

Notice: Deprecated call without request object. in /home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/classes/template/PKPTemplateManager.inc.php on line 1295

Warning: Cannot modify header information - headers already sent by (output started at /home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/classes/template/PKPTemplateManager.inc.php:1295) in /home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/classes/template/PKPTemplateManager.inc.php on line 1236

Warning: Cannot modify header information - headers already sent by (output started at /home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/classes/template/PKPTemplateManager.inc.php:1295) in /home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/classes/template/PKPTemplateManager.inc.php on line 1237


[u]Warnings while Loading the Dashboard : https://iqmrj.com/index.php/iqmrj/submissions[/u]

Deprecated: Smarty_Internal_Runtime_Inheritance::process(): Implicitly marking parameter $parent as nullable is deprecated, the explicit nullable type must be used instead in

/home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_runtime_inheritance.php on line 168


[u]Warnings while loading Dashboard : https://iqmrj.com/index.php/iqmrj/manageIssues[/u]

Deprecated: Smarty_Internal_Runtime_Inheritance::process(): Implicitly marking parameter $parent as nullable is deprecated, the explicit nullable type must be used instead in

/home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_runtime_inheritance.php on line 168


While Removing Announcement Type

Error:
https://iqmrj.com/index.php/iqmrj/$$$call$$$/grid/announcements/announcement-type-grid/delete-announcement-type?announcementTypeId=2 403 (Forbidden)


[u]While Loading “Roles” - https://iqmrj.com/index.php/iqmrj/management/settings/access#roles[/u]

1 - 17 of 17 items
Deprecated: Smarty_Internal_Method_GetTemplateVars::getTemplateVars(): Implicitly marking parameter $_ptr as nullable is deprecated, the explicit nullable type must be used instead in /home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_method_gettemplatevars.php on line 34

Deprecated: Smarty_Internal_Method_GetTemplateVars::_getVariable(): Implicitly marking parameter $_ptr as nullable is deprecated, the explicit nullable type must be used instead in /home/fs3opx8rohmi/public_html/iqmrj.com/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_method_gettemplatevars.php on line 87


[u]While Editing “Journal” - https://iqmrj.com/index.php/iqmrj/management/settings/context[/u]

/index.php/iqmrj/api/v1/contexts/1:1 Failed to load resource: the server responded with a status of 403 ()


While Upgrading Plugin Default theme

jquery.min.js?v=3.3.0.19:2 GET https://iqmrj.com/index.php/iqmrj/$$$call$$$/grid/settings/plugins/settings-plugin-grid/upgrade-plugin?plugin=defaultthemeplugin&category=themes&_=1770022817172 403 (Forbidden)