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java.lang.NullPointerException: 	at org.tomdz.maven.sphinx.SphinxMojo.runSphinx(SphinxMojo.java:234)	at org.tomdz.maven.sphinx.SphinxMojo.executeReport(SphinxMojo.java:156)	at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:135)	at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:164)	at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.java:328)	at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:132)	at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:142)	at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:109)	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)	at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)	at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)	at org.codehaus.classworlds.Launcher.main(Launcher.java:375)