Hello! 

I am working on the challenge for the BulkApexTriggers section and I keep receiving the following error. I am not sure what is wrong with my system. I have a Discount Percentage field under Accounts and Opportunities and that field is not required for the challenge. I received this error message for a lot of triggers I have tried to imput, and I'm not really sure what is going on. 

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: REQUIRED_FIELD_MISSING, Required fields are missing: [Discount_Percent__c]: [Discount_Percent__c]

Here is the Trigger I have entered into my Developer Console. 

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

    List<Task> taskList = new List<Task>();
    
    for (Opportunity opp : [SELECT Id, StageName FROM Opportunity WHERE StageName = 'Closed Won' AND Id IN :Trigger.new]){
                    
            taskList.add(new Task(Subject = 'Follow Up Test Task',
                                  WhatId = opp.Id));
       
    }

    if(taskList.size()>0){
        
        insert taskList;
        
    }
    
}

Thanks for your help!