NPE during execution of mvn clean site

  <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>latex-maven-plugin</artifactId>
    <version>1.1</version>
    <executions>
      <execution>
        <phase>pre-site</phase>
        <goals>
          <goal>latex</goal>
        </goals>
        <configuration>
          <binariesPath>/usr/bin/pdflatex</binariesPath>
          <docsRoot>${project.build.directory}/generated-site/latex/maui-guide/maui-guide.tex</docsRoot>
          <latexBuildDir>${project.build.directory}/generated-site/latex/maui-guide/</latexBuildDir>
        </configuration>
      </execution>
    </executions>
  </plugin>

[INFO] 
[INFO] --- latex-maven-plugin:1.1:latex (default) @ maui ---
[DEBUG] org.codehaus.mojo:latex-maven-plugin:jar:1.1:
[DEBUG]    org.apache.maven:maven-plugin-api:jar:2.0.2:compile
[DEBUG]    org.apache.commons:commons-exec:jar:1.0.1:compile
[DEBUG]    org.apache.commons:commons-io:jar:1.3.2:compile
[DEBUG]    org.codehaus.plexus:plexus-utils:jar:1.1:runtime
[DEBUG] Created new class realm plugin>org.codehaus.mojo:latex-maven-plugin:1.1
[DEBUG] Importing foreign packages into class realm plugin>org.codehaus.mojo:latex-maven-plugin:1.1
[DEBUG]   Imported:  < project>com.soebes.maven.guide:maui:0.1-SNAPSHOT
[DEBUG] Populating class realm plugin>org.codehaus.mojo:latex-maven-plugin:1.1
[DEBUG]   Included: org.codehaus.mojo:latex-maven-plugin:jar:1.1
[DEBUG]   Included: org.apache.commons:commons-exec:jar:1.0.1
[DEBUG]   Included: org.apache.commons:commons-io:jar:1.3.2
[DEBUG]   Included: org.codehaus.plexus:plexus-utils:jar:1.1
[DEBUG]   Excluded: org.apache.maven:maven-plugin-api:jar:2.0.2
[DEBUG] Configuring mojo org.codehaus.mojo:latex-maven-plugin:1.1:latex from plugin realm ClassRealm[plugin>org.codehaus.mojo:latex-maven-plugin:1.1, parent: sun.misc.Launcher$AppClassLoader@1a16869]
[DEBUG] Configuring mojo 'org.codehaus.mojo:latex-maven-plugin:1.1:latex' with basic configurator -->
[DEBUG]   (f) binariesPath = /usr/bin/pdflatex
[DEBUG]   (f) buildDir = /home/kama/ws-git/maui/target
[DEBUG]   (f) commonsDirName = common
[DEBUG]   (f) docsRoot = /home/kama/ws-git/maui/target/generated-site/latex/maui-guide/maui-guide.tex
[DEBUG]   (f) latexBuildDir = /home/kama/ws-git/maui/target/generated-site/latex/maui-guide
[DEBUG] -- end configuration --
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7.908s
[INFO] Finished at: Sat May 28 22:00:06 CEST 2011
[INFO] Final Memory: 22M/252M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:latex-maven-plugin:1.1:latex (default) on project maui: Execution default of goal org.codehaus.mojo:latex-maven-plugin:1.1:latex failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:latex-maven-plugin:1.1:latex (default) on project maui: Execution default of goal org.codehaus.mojo:latex-maven-plugin:1.1:latex failed.
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default of goal org.codehaus.mojo:latex-maven-plugin:1.1:latex failed.
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 19 more
Caused by: java.lang.NullPointerException
	at org.codehaus.mojo.latex.LaTeXMojo.prepareLaTeXBuildDirectories(LaTeXMojo.java:201)
	at org.codehaus.mojo.latex.LaTeXMojo.execute(LaTeXMojo.java:95)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	... 20 more
[ERROR] 
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException