After upgrading to OJS 3.5.x, I am getting an error whenever I try to edit an existing role (User Group) or add a new role. The page fails to load and displays this error: PKP\invitation\invitations\userRoleAssignment\helpers\UserGroupHelper::formatDate(): Argument #1 ($timestamp) must be of type s…

asmecher November 25, 2025, 5:23pm 2

See this forum thread. We’re releasing OJS 3.5.0-2 within a couple of days, and it’ll include a fix for this issue.

Regards,
Alec Smecher
Public Knowledge Project Team

Error when editing or adding roles after upgrade to OJS 3.5