Bugfix. Scaffolding is now a separate plugin.

See more:
http://grails.org/doc/2.3.x/guide/upgradingFromPreviousVersionsOfGrails.html

grails-fields\grails-app\taglib\grails\plugin\formfields\FormFieldsTagLib.groovy: 22: unable to resolve class org.codehaus.groovy.grails.scaffolding.DomainClassPropertyComparator
 @ line 22, column 1.
   import org.codehaus.groovy.grails.scaffolding.DomainClassPropertyComparator
   ^