```
@istest private class Penalizacion_Memo_isTest {

@istest static void test_Memo(){
    user u = new user();
    u.MEMO__c=TRUE;
    u.LastName = 'Test Code';
    u.Email = 'test@test.com';
    u.Alias = 'Tcode';
    u.Username = 'test12345@test.com';
    u.CommunityNickname = 'test12';
    u.LocaleSidKey = 'en_US';
    u.TimeZoneSidKey = 'GMT';
    u.ProfileID = '00e36000000ao2F';
    u.LanguageLocaleKey = 'en_US';
    u.EmailEncodingKey = 'UTF-8';
    insert u;
}
}

```

This is my code. I've already changed the username a couple of times and still receive the same error even though I'm absolutely positive there is no user with that username in any of our organizations.

Error:

> 
> System.DmlException: Insert failed. First exception on row 0; first
>  error: DUPLICATE\_USERNAME, Duplicate Username.  
> The username already
>  exists in this or another Salesforce organization. Usernames must be
>  unique across all Salesforce organizations. To resolve, use a
>  different username (it doesn't need to match the user's email
>  address). : [Username] Stack Trace:
>  Class.Penalizacion\_Memo\_isTest.test\_Memo: line 16, column 1
> 
> 
>