pom.xml报错

用eclipse4.20新建了一个maven项目，选择的项目模板maven-archetype-webapp

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创建工程后pom.xml一直报错

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报错内容：Cannot access defaults field of Properties

下面是我的pom.xml全文

​<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.pony.mvn</groupId>
  <artifactId>demo</artifactId>
  <packaging>war</packaging>
  <version>1</version>
  <name>demo Maven Webapp</name>
  <url>http://maven.apache.org</url>
 
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.9</version>
    </dependency>
    <dependency>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-war-plugin</artifactId>
      <version>3.3.1</version>
      <type>maven-plugin</type>
    </dependency>
    <dependency>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.8.1</version>
      <type>maven-plugin</type>
    </dependency>
    
    
  </dependencies>
 
  <build>
    <finalName>demo</finalName>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>