swftools on v6.3

[ivbo]

I succesfully build LogicalDOC v6.3 CE. There is new parameter for SWFtools path.
I set it to /usr/bin where is swftools commands on ubuntu 10.04 LTS.
If I try Preview in GUI I found in the log file following error:

19.10.2011 16:01:51,634 ERROR (com.logicaldoc.web.DocumentPreview: 279) -- Error in document to SWF conversion
java.io.IOException: Cannot run program ""/usr/bin/pdf2swf"": java.io.IOException: error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:475)
at java.lang.Runtime.exec(Runtime.java:610)

/usr/bin/pdf2swf is accesible from shell withou any problem ...

What are the requirements for SWFtools path configuration ?