Comment 2 for bug 111810

The same error appears with texlive 2007-13 on hardy. But: I recommend not to use prosper, this class is very old (last change: 2002-11-25), now it seems to be incompatible with the newer pstricks packages. I recommend to use powerdot instead, it's based on prosper and ha-prosper. The beamer package is another very good alternative.