No filename given for result file, using stdout for logging results

Hello,

By now I did not have any problems with rapidMiner Studio but from nom on I can't do anything with it because I have this message in the log :

Oct 1, 2015 10:26:42 AM FINER: Parameter send_mail is not set. Using default (never).
Oct 1, 2015 10:26:42 AM FINER: Parameter send_mail is not set. Using default (never).
Oct 1, 2015 10:26:42 AM FINER: Parameter logverbosity is not set. Using default (init).
Oct 1, 2015 10:26:42 AM FINER: Parameter logfile is not set. Using default ().
Oct , 2015 10:26:42 AM FINER: Parameter random_seed is not set. Using default (2001).
Oct 1, 2015 10:26:42 AM FINER: Parameter resultfile is not set. Using default ().
Oct 1, 2015 10:26:42 AM INFO: No filename given for result file, using stdout for logging results!
Oct 1, 2015 10:26:42 AM INFO: Loading initial data.
Oct 1, 2015 10:26:42 AM INFO: Process starts
Oct 1, 2015 10:26:43 AM FINER: Parameter time_zone is not set. Using default (SYSTEM).
Oct 1, 2015 10:26:43 AM FINER: Parameter encoding is not set. Using default (SYSTEM).
Oct 1, 2015 10:26:43 AM FINER: Parameter datamanagement is not set. Using default (double_array).
Oct 1, 2015 10:26:43 AM FINER: Parameter locale is not set. Using default (English (United States)).
Oct 1, 2015 10:26:43 AM INFO: Saving results.
Oct 1, 2015 10:26:43 AM INFO: Process finished successfully after 0 s
Oct 1, 2015 10:26:43 AM FINER: Parameter send_mail is not set. Using default (never).
Oct 1, 2015 10:26:43 AM FINE: Missing I18N key: gui.action.choose_plotter.label

So I wondered if you already had this problem because I seems that the plot module does not work.

Thanks,

Gaël.