Hello,

I have a custom controller extension below which pre-populates the Opportunity ID and a Contact Role ID to a Visualforce page for a custom object that has a Master-Detail relationship to the Opportunity object.  I am now trying to create 2 buttons on the VF page that will populate a 3rd custom field, save the custom object record, and re-direct the user to another VF page.  However, when I try to save the code below I get the error:  

Error: VF_CampaignCaseCreateController Compile Error: Initial term of field expression must be a concrete SObject: List<Campaign_Create_Request__c> at line 37 column 9

I'm sure my syntax is incorrect for populating the 3rd field in each method, but I'm not sure how to fix it.
 

public class VF_CampaignCaseCreateController{
    
    public List<Campaign_Create_Request__c> CCR {get; set;}
    
        private final Opportunity opp;
        public VF_CampaignCaseCreateController(ApexPages.StandardController myController){
            CCR = new List<Campaign_Create_Request__c>();
                if (!Test.isRunningTest())
                {
                myController.addFields(new List<String>{'Id', 'OwnerId', 'Owner.Phone'});
                }
            opp=(Opportunity)myController.getrecord();
        }
    
        public Campaign_Create_Request__c CCR2 = new Campaign_Create_Request__c();
            public void CampaignCaseCreate(){
           
                CCR2.Opportunity__c = opp.Id;
    
                Opportunity o = [SELECT (SELECT Id, contactId
                                           FROM OpportunityContactRoles
                                           WHERE role = 'Signatory')
                                FROM Opportunity
                                WHERE id = :opp.id];
                CCR2.Primary_User__c = o.opportunityContactRoles.size() != 0 
                                        ? o.opportunityContactRoles[0].contactId  
                                        : null;
    
                CCR.add(CCR2);
            }
    
    
        public PageReference AdCamp() {
    
            insert CCR;
            CCR.Requested_Action__c = 'Create and Add';
    
               PageReference RetPage = new PageReference('/VF_CampaignCreate_Edit?id=' + CCR[0].id);
            RetPage.setRedirect(true);
            return RetPage; 
        }
    
        public PageReference Camp() {
    
            insert CCR;
            CCR.Requested_Action__c = 'Create Only';
    
               PageReference RetPage = new PageReference('/VF_CampaignCreate_Edit?id=' + CCR[0].id);
            RetPage.setRedirect(true);
            return RetPage; 
        }
    
    }