PostCopy Refresh Script not executing after Sandbox refresh/Creation

global class sandboxRefreshScript implements SandboxPostCopy{
global void runApexClass(SandboxContext context)
{
List<Account> accounts = new List<Account>();
Account a1 = new Account();
a1.Name = 'J&T Autolease';
a1.Ownerid = '005w0000005bvNR';
a1.Type = 'LeaseCo';
a1.Status__c = 'Partner';    
a1.BillingCity = 'Greensboro';
accounts.add(a1);
Account a2 = new Account();
a2.Name = 'Test Account ';
a2.Type = 'Client';
a2.BillingState = 'NC';
a2.BillingCity = 'Greensboro';    
accounts.add(a2);
insert Accounts;
List<Contact> contacts = new List<Contact>();
Contact b1 = new Contact();
b1.Salutation = 'Mr.';
b1.FirstName = 'Pieter';
b1.LastName = 'Pan';
b1.Email = 'c.leusink@newmotion.com';    
b1.Accountid = a1.ID;    
contacts.add(b1);
insert Contacts;
List<Opportunity> opportunities = new List<Opportunity>();
Opportunity c1 = new Opportunity();
c1.Name = 'Zonnestraal';
c1.Ownerid = '005w0000005bvM4';
c1.StageName = 'Intake';
c1.Accountid = a1.ID;    
opportunities.add(c1);
insert Opportunities;
List<Payment_Account__c> paymentaccounts = new List<Payment_Account__c>();
Payment_Account__c d1 = new Payment_Account__c();
d1.Name = 'Zonnestraal';
d1.Ownerid = '005w0000005bvM4';
d1.Billing_Name__c = 'Zonnestraal BV';   
d1.Billing_Email__c = 'l.schutter@newmotion.com';
d1.Payment_Terms__c = '14';
d1.Billing_Address__c = 'rue de Bastonge 4';      
d1.Billing_PostalCode__c = 'rue de Bastonge 4';      
d1.Billing_City__c = 'Gorbous';      
d1.Billing_Country__c = 'LU'; 
paymentaccounts.add(d1);
insert paymentaccounts;       
}
}