Idea Error assembling War:webxml attribute is required (or pre-existing web-inf/web.xml if executin

One, error message: Assembling War:webxml attribute is required (or pre-existing web-inf/web.xml if executing in update mode)

Second, error analysis:

According to the error message, the deployment descriptor Web. XML is not found, typically the MAVEN project's site root is "WebApp", the directory structure is App-web\src\main\webapp,

But I used the IntelliJ idea to build the project so the root directory is "Web".

Third, the solution

1, the Project right button select Open Module Setting (F4)

2, click OK, build through