Hello,
I found the problem:
<http://www.nabble.com/Re:-RE-:-m2.0.1-trouble-with-mojo-report-with-
maven-reporting-impl-with-version-2.0.1-p1924827.html>
There is a problem with version 2.0.1 of the reporting-impl.
I reverted the reporting dependency to version 2.0. It works now.
<dependency>
<groupId>org.apache.maven.reporting</groupId>
<artifactId>maven-reporting-impl</artifactId>
<version>2.0</version>
</dependency>
<dependency>
<groupId>org.apache.maven.reporting</groupId>
<artifactId>maven-reporting-api</artifactId>
<version>2.0</version>
</dependency>
Regards,
Cyrill