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Mark Azuolas (National Debt Relief) asked in #Trailhead
May 18, 2018, 7:52 PM

Bulk Apex Triggers challenge error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY

Hi,

I'm getting stuck on the bulk apex trigger challenge on trailhead and keep recieving the same error:

Challenge Not yet complete... here's what's wrong: 

There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, ClosedOpportunityTrigger: execution of AfterInsert caused by: System.NullPointerException: Attempt to de-reference a null object Trigger.ClosedOpportunityTrigger: line 9, column 1: []

I've tried creating new playgrounds for just htis challenge after seeing advice on here but I still get the same error.

Here is the trigger that I wrote, I cant find any reason for this error to happen.

trigger ClosedOpportunityTrigger on Opportunity (after insert, after update) {

    List<Task> taskList;

    for(Opportunity opp : Trigger.new){

        if(opp.StageName == 'Closed Won'){

            taskList.add(new Task(whoId=opp.id,subject='Follow Up Test Task'));

        }

    }

    insert taskList;

}

And this is the trailhead im attempting: https://trailhead.salesforce.com/trails/force_com_dev_beginner/modules/apex_triggers/units/apex_triggers_bulk
5 answers
  1. Daenerys Targaryen
    Jan 23, 2020, 4:18 PM
    I made changes to the above code to have it execute:

     

    trigger ClosedOpportunityTrigger on Opportunity (before insert, before update) {
      List<Task> tasks = New List<Task>();
      for (opportunity opp:trigger.new) {
        if (opp.stagename=='Closed Won') {
          task t=new Task(
            whatid=opp.id, 
            Status = 'Active',
            Subject = 'Follow Up Test Task',
            ActivityDate = system.today()
          );
          tasks.add(t); 
        }
      }
      insert tasks;
    }

     
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