apiviz 1.0.3 can't generate javadocs when there is only 1 package

[INFO] An error has occurred in JavaDocs report generation:Exit code: 1 - javadoc: error - An error occurred during diagram generation: java.io.FileNotFoundException: File not found: /home/carlo/work/ejb3/timerservice-spi/target/site/apidocs/overview-summary.html
java.io.FileNotFoundException: File not found: /home/carlo/work/ejb3/timerservice-spi/target/site/apidocs/overview-summary.html
at net.gleamynode.apiviz.APIviz.instrumentDiagram(APIviz.java:140)
at net.gleamynode.apiviz.APIviz.generateOverviewSummary(APIviz.java:90)
at net.gleamynode.apiviz.APIviz.start(APIviz.java:64)
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:585)
at com.sun.tools.javadoc.DocletInvoker.invoke(DocletInvoker.java:269)
at com.sun.tools.javadoc.DocletInvoker.start(DocletInvoker.java:143)
at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:340)
at com.sun.tools.javadoc.Start.begin(Start.java:128)
at com.sun.tools.javadoc.Main.execute(Main.java:41)
at com.sun.tools.javadoc.Main.main(Main.java:31)

Command line was:"cd /home/carlo/work/ejb3/timerservice-spi/target/site/apidocs && /usr/java/jdk1.5.0_15/jre/../bin/javadoc" @options @packages