BoincStudio Not working...

Hi guys, I installed boincstudio and configure to point for my Trux 5.3.12.TX36.

It connect perfect showing my E@H stats, when I try to change the number of CPUs to 4 I got his error :

05/06/2006 19:06: Processing connection to localhost
05/06/2006 19:06: Connected to localhost
05/06/2006 19:06: localhost bs_project_set_cpus failed. unrecognized op

What to do? Am I doing something wrong? There's a kind of manual of this software?

Best Regards,

Rafael Valente