Unable to instantiate Action异常

严重: Exception occurred during processing request: Unable to instantiate Action, SsbkAction,  defined for 'SsbkAction' in namespace ''Error creating bean with name 'SsbkAction' defined in file [D:\Program Files (x86)\Liuhe\code\myeclipse 2014 code\.metadata\.me_tcat7\webapps\HUT\WEB-INF\classes\applicationContext-actions.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'com.sun.proxy.$Proxy15 implementing com.hut.dao.BaseDao,org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised' to required type 'com.hut.service.SsbkService' for property 'ssbkService'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [com.sun.proxy.$Proxy15 implementing com.hut.dao.BaseDao,org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.hut.service.SsbkService] for property 'ssbkService': no matching editors or conversion strategy found严重: Exception occurred during processing reques