Sample Insert Related records not working.

As the title says, the sample code in the module instructions generate an error where the console says that the account number must be more than 8 characters long. I use the same code as provided in the example:

Account acct = new Account(Name='SFDC Account');

insert acct;

// Once the account is inserted, the sObject will be

// populated with an ID.

// Get this ID.

ID acctID = acct.ID;

// Add a contact to this account.

Contact mario = new Contact(

    FirstName='Mario',

    LastName='Ruiz',

    Phone='415.555.1212',

    AccountId=acctID);

insert mario;

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However this generates the following error:

Anybody have any ideas as to what might be going on?

Thanks.