关于springboot启动报错找不到mapper的问题？

新建一个springboot项目，实现简单的增删查改功能项目结构、配置文件、项目文件如图所示，项目启动报错：Field pinyinMapper in com.lilei.service.impl.PinyinServiceImpl required a bean of type 'com.lilei.mapper.PinyinMapper' that could not be found.说是找不到mapper，请指点