I need to send an email to one of two Public Groups depending on the value of the 3 fields in the `If Statement`. Within the the If and Else blocks I have a `String mailGroup` with the value of the Public Class.Now that I need the Else statement to access that private class with a different Public class name, I am having issues inserting `String mailGroup` , into the Private class `getAddresses()`. The Variable `emailAdds` declared at the top holds the email address values from the `getAddresses()` function. Is it my syntax? I am receiving numerous errors:

`Unexpected token 'private'`
 `Unexpected token '<'`
`Unexpected token '>'`

`Method does not exist or incorrect signature: void getAddresses(String) from type CaseHandlerCountAlert`

 

trigger CaseHandlerCountAlert on Case (after insert) {
    
 				String messageToSend;
   				List<String> ListOfMessages = new List<String>();
   		     	Set<Id> AcctIds = new Set<Id>();
				List<String> clientEmail;
				String messageBody;
    			String mailGroup;
    			List<String> emailAdds = getAddresses(mailGroup);
    
List<AggregateResult> AggregateResultList = [SELECT AccountId, Account.Name name, COUNT(Id) co
                                             FROM Case
                                             WHERE CreatedDate = LAST_N_DAYS:1 AND 
                                             Id IN :Trigger.New
                                             GROUP BY AccountId, Account.Name
                                             HAVING COUNT(Id)  >= 5 ];
    		 
            Map<Id, String> accountIdEmailmessageMap = new Map<Id, String>();
            
				for(AggregateResult aggr: AggregateResultList){
                String messageToSend = 'Account name: ' + aggr.get('name') +
                    ' has ' + (Integer)aggr.get('co') +
                    ' cases opened in the last 8 days.';
                Id accId = (Id)aggr.get('AccountId');
                accountIdEmailmessageMap.put(accId,messageToSend);
                AcctIds.add(accId); 
            }
            
			
List<Case> caseList = [SELECT Id, AccountId, Account.Name,Parent_Project_if_applicable__r.Implementation_status__c,
                       Parent_Project_if_applicable__r.PM_Implementation_Status__c, 
                       Parent_Project_if_applicable__r.RCM_Implementation_Status__c,
                       Parent_Project_if_applicable__r.Client_Advisor_Email__c
                       FROM Case
                       WHERE AccountId IN :AcctIds];

for(Case cl:caseList){ 
  
    if(cl.Parent_Project_if_applicable__r.Implementation_status__c == 'Live - Closed Project'||
       cl.Parent_Project_if_applicable__r.PM_Implementation_Status__c == 'Live - Closed Project'||
       cl.Parent_Project_If_Applicable__r.RCM_Implementation_Status__c == 'Live - Closed Project'){    
        	
           	
            mailGroup = 'Customer Success Managers'; 
           
	String messageBody = accountIdEmailmessageMap.get(cl.AccountId);
        
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
	  mail.setSenderDisplayName('IT Support'); 
          mail.setToAddresses(emailAdds);
          mail.Subject = 'Multiple cases created alert message';
          mail.setPlainTextBody(messageBody);
           
         if(messageToSend != null){
          Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
          }
        
    }
    else{  
            
      			
         mailGroup = 'BI Team';
         
        
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
	  mail.SetSenderDisplayName('IT Support');
          mail.setToAddresses(emailAdds);
          mail.Subject = 'Multiple cases created alert message';
          mail.setPlainTextBody(messageToSend);
      
        
        if(messageToSend != null){
          Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
        }
    }
       
         
    }

    


private List<String> getAddresses(mailGroup){
    List<User> UserList =
        [SELECT id, name, email
         FROM User 
         WHERE id 
         IN (SELECT userorgroupid 
             FROM groupmember
             WHERE group.name = :mailGroup)];
    
    List<String> emailString = new List<String>();
    
    for(User u: UserList){
        emailstring.add(u.email);
    }   
    return (emailString);
    //System.debug(emailString);
}    

               }