【maven】pom.xml报错：Cannot detect Web Project version.

新建的maven项目 报错如下：

1 Cannot detect Web Project version. Please specify version of Web Project through <version> configuration property of war plugin. E.g.: <plugin> <artifactId>maven-
2  war-plugin</artifactId> <configuration> <version>3.0</version> </configuration> </plugin>

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