gradle tomcat启动问题

gradle tomcatRunDebug 启动项目时报找不到项目根目录

项目目录为：F:\student\project\20170301

FAILURE: Build failed with an exception.

• What went wrong:
  Task 'tomcatRunDebug' not found in root project '20170301'.

• Try:
  Run gradle tasks to get a list of available tasks. Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

gradle tomcatRunDebug这个命令是哪儿定义的，似乎没有找到这个命令，我在构建gradle项目时没有遇到过这个命令呀。