idea部署非maven项目，不能打成war包

Question

idea部署一个非maven项目时，报异常：Error during artifact deployment. See server log for details部署时提示以下错误：
[2017-01-03 10:02:46,290] Artifact Demo:war exploded: Artifact is being deployed, please wait...
[2017-01-03 10:02:46,309] Artifact Demo:war exploded: Error during artifact deployment. See server log for details.

这个是我的目录结构，
想请教一下各位大牛，这个是什么原因导致的？谢谢，在线等。