trigger
----------
trigger OpportunityUpdateFromTicket on Case (before insert,after insert,before update,after update) {
   
    if(trigger.isAfter&&(trigger.isInsert || trigger.isUpdate))
    {
    OpportunityUpdateFromTicketHandler.emailNotificationFromIteroBackOffice(trigger.new,trigger.oldMap);
   
    }
   }

Helper class
------------------------
public class OpportunityUpdateFromTicketHandler {
    
    Public static void emailNotificationFromIteroBackOffice(List<case> ticketList,Map<String,Case> oldMapCase)
    {
        EmailTemplate et = [SELECT Id,Subject, Body FROM EmailTemplate WHERE DeveloperName ='iTero_back_office_Template'];
       Map<ID, RecordType> recordTypeMap = New Map<ID, RecordType>([Select ID, Name From RecordType Where sObjectType = 'Case']);
        List<string> toAddress = new List<string>();
        toAddress.add('scannerinstall@aligntech.com');
        List<Messaging.SingleEmailMessage> allmsg = new List<Messaging.SingleEmailMessage>();
        
        for(Case ticket :ticketList)
        {
        if(recordTypeMap.get(ticket.recordTypeID).name.containsIgnoreCase('iTero Contracts') && ticket.Ticket_Type__c =='New scanner sale' && ticket.Final_Status__c != oldMapCase.get(ticket.Id).Final_Status__c && ticket.Final_Status__c =='Processed/Assigned to Logistics' )
        {
            if(ticket.Region__c =='NA' || ticket.Region__c =='LATAM')
            {
                Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
                mail.setTemplateId(et.Id);
                mail.setToAddresses(toAddress);
                mail.setSubject(et.subject);
                mail.setHTMLBody(et.Body);
                allmsg.add(mail);
            }
        }
        
        }
        Messaging.sendEmail(allmsg);
        
   }

}

error:
----------
Method does not exist or incorrect signature: void emailNotificationFromIteroBackOffice(List<Case>, Map<Id,Case>) from the type OpportunityUpdateFromTicketHandler

Thanks!!