I had a requirement where i need to create records based on the Campaign Members in the Opportunity.i had done the trigger and the code was working fine but today i had an error .Can anyone help me out !
Error:Apex trigger CreateList caused an unexpected exception, contact your administrator: CreateList: execution of AfterUpdate caused by: System.DmlException: Insert failed. First exception on row 0 with id 0062800000CMrpPAAT; first error: INVALID_FIELD_FOR_INSERT_UPDATE, cannot specify Id in an insert call: [Id]: Trigger.CreateList: line 34, column 1

trigger CreateList on Campaign (after insert) {
     List<Opportunity> opp = new List<Opportunity>();
    List <OpportunityContactRole> ocrole = new List<OpportunityContactRole>();
     public integer iOPPCount {get; set;}
    public integer icount {get; set;}
    
    
 for( Campaign camp : trigger.new ){
     if( camp.Create_List__c == True ){
             String sCamp= String.valueof(camp.id);
             iOPPCount  = [SELECT count() FROM CampaignMember WHERE CampaignId =:sCamp];
             if (iOPPCount  > 0 ){                
                // camp.addError(String.Valueof(iOPPCount));
                 List<CampaignMember> camps = [SELECT id,FirstName,LastName,CompanyOrAccount,ContactId FROM CampaignMember WHERE CampaignId =:sCamp];            
                 
                 for(CampaignMember CM : camps){
                     String sEvent = String.valueof(camp.EventIDName__c);
                     String sName = String.valueof(CM.FirstName) + ' ' + String.valueof(CM.LastName);
                     icount = [SELECT count() FROM Opportunity WHERE Campaign__c =:camp.Id and Name=:sEvent +'-' + sName];
                     
                     if (icount == 0){                    
                         
                     // camp.addError(sEvent + '-' + sLast);
                  //Opportunity  op = new Opportunity(Campaign__c=camp.Id,Name=sEvent+ '-' + sName,CloseDate=camp.EndDate,StageName='Prospecting'); 
                  Opportunity op = new Opportunity(
                      Campaign__c=camp.Id,
                      Name=sEvent +'-' + sName,
                      CloseDate=camp.EndDate,
                      StageName='Prospecting',
                      Contact__c= cm.ContactId );                                                            
                   opp.add(op);                                                                       
                  }
                        insert opp;    
              
                 for(Opportunity ops : opp){
                     string sOppId = String.Valueof(ops.get('id'));
                     string sConId = String.Valueof(ops.get('Contact__c'));
                // camp.addError(String.Valueof(opp[0].id));        
                                       
                  OpportunityContactRole ocr = new OpportunityContactRole(
                    OpportunityId = sOppId,
                    //ContactId = cm.ContactId,
                    ContactId = sConId,
                    IsPrimary = TRUE);
                     ocrole.add(ocr);
                    }
                 insert ocrole;    
                 
               // insert ocrole;        
               }  
             } else if(iOPPCount  < 0){
                 //do nothing
             }
               /*  {
                     List<Contact> OPPList =[Select Name from  Contact];
                     for ( Contact OPP : OPPList  )
                     {
                         String sOPPList= String.Valueof( OPP.get( 'Name' ) );
                         Opportunity o = new Opportunity( Campaign = camp.id, Name=camp.Name + '-' + sOPPList ,Contact__c =camp.Contact__c );
                         ot.add( o );
                     }
                     insert ot;
                 } */
         }
 }

}