Grails warning at compile of controllers

I am currently getting the warning in Grails of 'The [update] action accepts a parameter of type [edu.acu.teachereval.SubjectCode] which has not been marked with @Validateable. Data binding will still be applied to this command object but the instance will not be validateable. @Transactional' along with the same errors for show, save, edit, and delete for the controller mentioned in the error and other controllers that I have created. I have seen this issue for user created functions, but I have not seen this error for functions that are built in to grails. Any assistance would be appreciated.