Symptoms:

You want to complete all the active tasks in one or more projects or project groups by selecting Complete Step on the Projects page of the WorldServer 11 interface. The tasks are in the same workflow step. However, if the projects or project groups also contain completed, canceled, restarted, or succeeded tasks, you cannot complete any tasks and the "Task <path> is not in a task step" message is displayed.

Resolution: 

You can fix this issue by deploying the update to WorldServer 11.2.2, available on FTP. After you deploy this update, WorldServer will only take into account active tasks when you complete all the tasks in a project or in a project group.

Note: This update only applies to WorldServer 11.2.2.

If you cannot deploy it, connect to the Customer Support Web Portal and log a case. You need an account to log a case. If you do not have an account, contact your company's SDL Support Account Administrator.