如题；

    ```
    <!--nutz spring配置 -->
       <bean id="nutDao" class="org.nutz.dao.impl.NutDao">
         <property name="dataSource" ref="dataSource" />
         <property name="runner" ref="springDaoRunner" />
         <property name="sqlManager" ref="sql" />
       </bean>
       <bean id="sql" class="org.nutz.dao.impl.FileSqlManager">
         <property name="paths">
          <value>sqls/mysql</value>
         </property>
       </bean>
    ```
    我这样做报错：
    nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'nutDao' defined in class path resource [spring-config.xml]: Cannot resolve reference to bean 'sql' while setting bean property 'sqlManager';
    nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sql' defined in class path resource [spring-config.xml]: Instantiation of bean failed; 
    nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.nutz.dao.impl.FileSqlManager]:
    No default constructor found; nested exception is java.lang.NoSuchMethodException: org.nutz.dao.impl.FileSqlManager.<init>()