Hello everybody

Sorry if i do a mistake by puting a post here. Would you say to me where i should post for this kind of message if i'm wrong?

So, i want to do working Pure data, Jack and Ardour together. When i start Jack, it's good. Then, when i start puredata with the command "pdextended -rt" in a terminal, sometimes i have the message i put in the title. And then when i start Ardour, this is the apocalypse with plenty of xruns and the same message.
I don't know what say this message.
It is a core i7 920 for the processor, ubuntu 11.04, 6Go for memory and a edirol UA25 for the sound-card.

Please,is there anybody who would say to me the significant?

Thank you very much for your help.