Error creating bean with name 'courseController': Unsatisfied dependency expressed through field 'courseService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'courseServiceImpl': Unsatisfied dependency expressed through field 'courseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'courseMapper' defined in file [D:\wnnj_workspace\phase3\coureselection\target\classes\com\wnnj\coureselection\mapper\CourseMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\wnnj_workspace\phase3\coureselection\target\classes\mapper\CourseMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\wnnj_workspace\phase3\coureselection\target\classes\mapper\CourseMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'course'. Cause: java.lang.ClassNotFoundException: Cannot find class: course

这个错误是由于在创建名为'courseController'的bean时出现了依赖问题。具体原因是在创建名为'courseServiceImpl'的bean时，出现了依赖问题，该bean依赖于名为'courseMapper'的bean。而在创建'courseMapper'时，又出现了依赖问题，该bean依赖于'CourseMapper.xml'文件中定义的'sqlSessionFactory'。最终导致的错误是在解析'Mapper XML'文件时出现了问题。

具体来说，错误信息指出了一个类别名解析失败的问题。它无法解析别名为'course'的类。可能的原因是找不到该类的定义，导致无法解析。

要解决这个问题，你可以检查以下几点：

1. 确保'course'类存在，并且已经添加到项目中。
2. 确保在'Mapper XML'文件中正确地引用了'course'类，并且类路径正确。
3. 如果使用了MyBatis Plus框架，确保配置文件中的类型别名设置正确。

通过检查和修复上述问题，应该能够解决这个错误。如果问题仍然存在，请提供更多的代码和配置信息，以便我更好地帮助你解决问题。