Login page- there where duplicate sections of code, looks like you ran the security assist wizard multiple times to cause the duplicates. i removed the duplicate code.
also one of the validations was set to enforce a 6 character minimum on the user name, this was failing because the user name you are using is not 6 characters long.
Contact page: The connection was pointing to Connections/interprimus.php, but the connection file is named with an uper case I, i updated that to:
to fix the error.
the other errors that are on the page are a a result of your mail script.
in the ScriptLibrary/incSmartMailer.php file, you should change line 7:
also for the form element value, you should use isset, for example:
value="<?php echo $_POST['first_name']; ?>"
value="<?php echo(isset($_POST['first_name'])?$_POST['first_name']:""); ?>"