groovy.lang.MissingPropertyException：没有这样的属性：class for state：org.hibernate.event.spi.PreDeleteEvent

Question

package products

import fiscalYears.FiscalYear

class Catagorie {
    String productCatagory;

    Date dateCreated
    Date lastUpdated
    String lastUpdatedBy
    String createdBy

    static constraints = {
        lastUpdatedBy nullable: true;
        createdBy nullable: true;
    }
    static belongsTo = [fiscalYear:FiscalYear];

    static auditable = true
    static stampable = true
    def onSave = {
        println "new catagorie  inserted"
        // may optionally refer to newState map
    }
    def onDelete = {
        println "catagorie  was deleted"
        // may optionally refer to oldState map
    }
    def onChange = { oldMap,newMap ->
        println "catagorie  was changed ..."
        oldMap.each({ key, oldVal ->
            if(oldVal != newMap[key]) {
                println " * $key changed from $oldVal to " + newMap[key]
            }
        })
    }
}

插入和更新工作，但我无法删除.delete()的实体; 但在评论static stampable = true时，删除工作。 处理删除操作时发生以下错误：

  

groovy.lang.MissingPropertyException：没有这样的属性：state for   class：org.hibernate.event.spi.PreDeleteEvent