ERROR - Context initialization failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productService' defined in class path resource [spring.xml]: Cannot resolve reference to bean 'productDao' while setting bean property 'productDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productDao' defined in class path resource [spring.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'sessionFatory' of bean class [cn.star.ssh.dao.ProductDao]: Bean property 'sessionFatory' is not writable or has an invalid setter method. Did you mean 'sessionFactory'?