Two things you can do,
1. Delete the old plugin in your pom.xml file.
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2</version>
</plugin>
2 Also, try running on your machine through command line,
mvn clean install
Let us know how it worked!