Field baseMapper in com.baomidou.mybatisplus.extension.service.impl.ServiceImpl required a single bean, but xx were found:

在学习使用 mybatis-plus 时，遇到一个奇怪的异常 如 代码一：

代码一：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-07-17 09:16:28.739 ERROR 9800 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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APPLICATION FAILED TO START
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Description:

Field baseMapper in com.baomidou.mybatisplus.extension.service.impl.ServiceImpl required a single bean, but 3 were found:
    - miguBusiHisMapper: defined in file [D:workspaceIdeaywjc-refactor	argetclassescomguollmodulesmiguProjectmapperMiguBusiHisMapper.class]
    - miguBusiInfoMapper: defined in file [D:workspaceIdeaywjc-refactor	argetclassescomguollmodulesmiguProjectmapperMiguBusiInfoMapper.class]
    - sysUserMapper: defined in file [D:workspaceIdeaywjc-refactor	argetclassescomguollmodulessysmanagemapperSysUserMapper.class]


Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed


Process finished with exit code 1

该错误怎么解决，求大佬指点