解决方案

在依赖下载中加上

<!-- https://mvnrepository.com/artifact/org.scala-tools/maven-scala-plugin -->
    <dependency>
      <groupId>org.scala-tools</groupId>
      <artifactId>maven-scala-plugin</artifactId>
      <version>2.11</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-eclipse-plugin -->
    <dependency>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-eclipse-plugin</artifactId>
      <version>2.5.1</version>
    </dependency>

即先将这两个依赖下载，然后就不报错了（一定要对应scala Sdk版本）
也可以在https://mvnrepository.com/中找到这俩下载到本地maven仓库中。