maven中pom配置 encoding 报错

配置：<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 报错

Description Resource Path Location Type
Project configuration is not up-to-date with pom.xml. Run Maven4MyEclipse->Update Project or use Quick Fix. ms line 1 Maven Configuration Problem

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<!-- Spring 使用版本  -->
<spring.version>4.1.6.RELEASE</spring.version>
<slf4j.version>1.7.7</slf4j.version>

</properties>

<plugin>

    <artifactId>maven-compiler-plugin</artifactId>
    <version>2.3.2</version>
    <configuration>
      <source>1.7</source>
      <target>1.7</target>
      **<encoding>${project.build.sourceEncoding}</encoding>**
    </configuration>
  </plugin>