got it. the error i had was throwing an error.
var schedule = schedule.content.get(),
validClasses = Fp.filter(schedule.classes, function (class) { return !class.passed; }),
inputClasses = $('.optimizeViaClasses input.className').map(function () { return $(this).val(); }),
actualValidClasses = Fp.pluck(validClasses, 'className');
$.each(inputClasses , function(index, value){
if($.inArray(value, actualValidClasses ) === -1){
$errorMessage.text('Your selection does not match the class(es) in the current schedule!');
$errorMessage.show();
error = true;
return false;
}
});