You need to create your own hook for registration_errors
filter:
add_filter( 'registration_errors', 'wpse8170_registration_errors', 10, 3 );
function wpse8170_registration_errors( $errors, $sanitized_user_login, $user_email ) {
if ( /* something happens */ ) {
$errors->add( 'myexception_code', 'This is my message' );
}
return $errors;
}
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