错误如下：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.2:compile (default-compile) on project imooc-video-admin-mng: Compilation failure: Compilation failure:
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[18,25] 程序包com.imooc.service不存在
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[19,23] 程序包com.imooc.utils不存在
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[20,23] 程序包com.imooc.utils不存在
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[27,17] 找不到符号
[ERROR] 符号: 类 UsersService
[ERROR] 位置: 类 com.imooc.controller.UsersController
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[36,16] 找不到符号
[ERROR] 符号: 类 PagedResult
[ERROR] 位置: 类 com.imooc.controller.UsersController
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[50,16] 找不到符号
[ERROR] 符号: 类 IMoocJSONResult
[ERROR] 位置: 类 com.imooc.controller.UsersController
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[38,17] 找不到符号
[ERROR] 符号: 类 PagedResult
[ERROR] 位置: 类 com.imooc.controller.UsersController
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[55,32] 找不到符号
[ERROR] 符号: 变量 IMoocJSONResult
[ERROR] 位置: 类 com.imooc.controller.UsersController
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[61,32] 找不到符号
[ERROR] 符号: 变量 IMoocJSONResult
[ERROR] 位置: 类 com.imooc.controller.UsersController
[ERROR] /E:/Eclipse/Workspace/imooc-video-admin/imooc-video-admin-mng/src/main/java/com/imooc/controller/UsersController.java:[64,24] 找不到符号
[ERROR] 符号: 变量 IMoocJSONResult
[ERROR] 位置: 类 com.imooc.controller.UsersController
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

这是为啥啊…我的包都有他为啥说不存在