Does requesters require a Help Desk Technicians license?

Does requesters require a Help Desk Technicians license?

When I try to create requesters under Workflow delegation I get this error:
Error in Adding Technician, You have purchased 20 Help Desk Technicians. Please disable or delete the default helpdesk technicians(helpdesk and hrmanager) and add Technicians. Please contact sales@zohocorp.com for purchase of additional Help Desk Technicians.
 
I have 14 Requesters including "ADManager Plus Admin" and 9 Technicians configured. I get the same error if I try to create a new Technician.
 
Thanks.
 
 

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