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 : *************************** APPLICATION FAILED TO START *************************** 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