Hello, 
I am attempting to create a trigger that populates an empty Country Code field (on an Event) given that the Assigned to Country Code (the event is assigned to someone) field is populated. I receive the following error after running a test on my Trigger. 

System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, SVMXC.Event_Trigger1: execution of BeforeInsert

caused by: System.NullPointerException: Attempt to de-reference a null object

Trigger.SVMXC.Event_Trigger1: line 104, column 1: []

Here is my trigger

public class SVMX_PopulateActivityCountryCode extends TriggerAction
{
    public Id eventRecordTypeId = Schema.SObjectType.Event.getRecordTypeInfosByName().get('PS WP CS').getRecordTypeId();
    List<ID> eventIDList = new List<ID>();
    public Event[] eventsToUpdate = new Event[]{};

    
    public SVMX_PopulateActivityCountryCode() 
    {
        //Call super to set batch variables and context 
        super();
    }
    
    public override Boolean shouldRun(){
        if(this.isInsert()&&!this.hasRun())
        {
            for(Event e: (List<Event>)Trigger.new)
            { 
                if(e.RecordTypeId == eventRecordTypeId && e.SXWP_Country_Code__c==null&& e.OwnerId!=null&&e.SXWP_Assigned_To_Country_Code__c!=null) 
                {
                    eventIDList.add(e.Id);
                }
            }
        }
        return !eventIDList.isEmpty();
    }
    
    
    public override void doAction()
    {
        this.markRun();
        
        for(Event existingEvent:[SELECT id FROM event WHERE id IN:eventIDList])
        {
            existingEvent.SXWP_Country_Code__c = existingEvent.SXWP_Assigned_To_Country_Code__c;
            eventsToUpdate.add(existingEvent);
        }
    
        update eventsToUpdate;
    }
    
    
}

and Here is the test class 

@isTest 
public class SVMX_PopulateActivityCCTest 
{
    private static Id techRecordTypeId = Schema.SObjectType.SVMXC__Service_Group_Members__c.getRecordTypeInfosByName().get('Technician').getRecordTypeId();
    private static Id teamRecordTypeId = Schema.SObjectType.SVMXC__Service_Group__c.getRecordTypeInfosByName().get('Technician').getRecordTypeId();
    private static Id eventRecordTypeId = Schema.SObjectType.Event.getRecordTypeInfosByName().get('PS WP CS').getRecordTypeId();
	private static Event currentEvent = new Event();
    private static User u = new User();
    private static SVMXC__Service_Group__c team = new SVMXC__Service_Group__c();
    private static SVMXC__Service_Group_Members__c technician = new SVMXC__Service_Group_Members__c();



    
    private static void setUpData()
    {
        team.RecordTypeId = teamRecordTypeId;
        team.Name = 'Carnival';
        insert team;
        
        u= TestUtil.createUser('00e120000019I9K');
        u.GID__c = 'Z002SH0P';
        insert u;
        
       	technician.RecordTypeId = techRecordTypeId;
        technician.SVMXC__Service_Group__c = team.Id;
        technician.Name = 'Victor Hugo';
        technician.SVMXC__Enable_Scheduling__c = True;
        technician.SVMXC__Active__c = True; 
        //The meat of the trigger lies in the following line
        technician.SXWP_Country_Code__c = 'CA';
        technician.SXWP_GID__c ='Z002SH0P';
        insert technician;
        
       id userId = [Select id from User where GID__c ='Z002SH0P'].get(0).Id;
      String techCC = [SELECT SXWP_Country_Code__c from SVMXC__Service_Group_Members__c WHERE SXWP_GID__c ='Z002SH0P' limit 1][0].SXWP_Country_Code__c;
       currentEvent.SXWP_Country_Code__c= NULL;
       currentEvent.Record_Id__c = eventRecordTypeId;
       currentEvent.OwnerId = userId;
       currentEvent.Subject = 'Event Test';
       currentEvent.Location = 'Location';
       currentEvent.Description='description';
       currentEvent.IsAllDayEvent=false;
       currentEvent.Start_Date__c= date.newInstance(1990, 11, 21);
        currentEvent.EndDateTime = date.newInstance(1990, 11, 22);
       insert currentEvent;
        

    }
    
    
     Static testmethod void updateEvent()
     {
         Test.startTest();
         setUpData();
         
         List<SVMXC__Service_Group_Members__c > sgm = [Select SXWP_Country_Code__c from SVMXC__Service_Group_Members__c Where Id = :technician.Id LIMIT 1];
         system.assertEquals(1,[Select Count() from SVMXC__Service_Group_Members__c  Where Id = :technician.Id]);
         
         List<Event> e = [Select SXWP_Assigned_To_Country_Code__c,SXWP_Country_Code__c from Event Where Id = :currentEvent.Id LIMIT 1];
         system.assertEquals(1,[Select Count() from Event Where Id = :currentEvent.Id]);
         
         system.assertNotEquals(NULL,e[0].SXWP_Country_Code__c);
         system.assertEquals(e[0].SXWP_Assigned_To_Country_Code__c,e[0].SXWP_Country_Code__c);
         Test.stopTest();
     }

    
}