VuGen error: Error writing to standard stream. The error code is '9

Hi, 

I've a problem with a Web Services Procotocol script. If I replay the bytecode, the error below appears:

     ....: Error: Error writing to standard stream. The error code is '9'.

The strange thing is that I had already run the code without problems. 

There isn't documentation about this fact on the net, so I ask to you an help to construe the error message. 

Thanks a lot, 

Lorenzo