CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, entity type cannot be inserted: Person Account: []

EXCEPTION_THROWN|[47]|System.DmlException: Insert failed. First exception on row 2; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, entity type cannot be inserted: Person Account: []

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.Phone = '013 820 07 00';
a1.BillingStreet = 'Kraaivenstraat 4';
a1.BillingCity = 'Tilburg';
a1.BillingPostalCode = '5048 AB';
a1.BillingState = 'Zuid-Holland';
a1.ShippingStreet = 'Kraaivenstraat 4';
a1.ShippingCity = 'Tilburg';
a1.ShippingPostalCode = '5048 AB';
a1.ShippingState = 'Zuid-Holland';    
accounts.add(a1);
Account a2 = new Account();
a2.Name = 'Adler';
a2.Ownerid = '005w0000006WaIF';
a2.BillingCountry = 'Netherlands';
a2.ShippingCountry = 'Germany';   
accounts.add(a2);
Account a3 = new Account();
a3.RecordTypeId = Schema.SObjectType.Account.getRecordTypeInfosByName().get('Person Account').getRecordTypeId();
a3.Status__c = 'Customer';    
a3.OwnerId = '005w0000004Sz1E';
a3.Salutation = 'Mr.';
a3.FirstName = 'Trafineo';
a3.LastName = 'Trafineo';    
a3.PersonEmail = 'settlement+trafineo@thenewmotion.com';
a3.PersonMailingCity = 'Bochum';
a3.PersonMailingStreet = 'Wittener Straße 56';
a3.PersonMailingPostalCode = '44789'; 
a3.PersonMailingCountry = 'Germany';
a3.hidden_email__c = 'settlement+trafineo@thenewmotion.com';    
accounts.add(a3);    
insert Accounts;
List<Contact> contacts = new List<Contact>();
Contact b1 = new Contact();
b1.Salutation = 'Mr.';
b1.FirstName = 'Arjen';
b1.LastName = 'Butter';
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 = 'J&T Autolease*';
d1.Ownerid = '005w0000005bvM4';
d1.Billing_Name__c = 'Financiele administratie';   
d1.Billing_Email__c = 'l.schutter@newmotion.com';
d1.Payment_Terms__c = '30';
d1.Billing_Address__c = 'Postbus 2094';      
d1.Billing_PostalCode__c = '5001 CB';      
d1.Billing_City__c = 'Tilburg';      
d1.Billing_Country__c = 'NL';
d1.Account__c = a1.Id;    
paymentaccounts.add(d1);
insert paymentaccounts;   
}
}