Dear Friends, I did a multi-dataset fit (9 data sets) and had the following problem: When trying to export all the fits to a single file (using save marked groups as), I got an empty file and artemis trapped a warning like the following. For sake of reproducing, I attached the file. My Tk version is the one which we should use (i.e. not the newest one) and saving just the experimental data in just the same fashion works... Any ideas why this happens? Regards, Norbert -- Error message follows -- Tk::Error: Can't call method "dispose" on unblessed reference at /usr/bin/artemi s line 7971. main::save_selected at /usr/bin/artemis line 7971 [\&main::save_selected,k] Tk callback for .menu1.menu.menu7 Tk::__ANON__ at /usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/Tk.pm li ne 228 Tk::Menu::Invoke at /usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/Tk/M enu.pm line 530 (command bound to event) main::__ANON__('Tk::Error: Can\'t call method "dispose" on unblessed ref erenc...') called at blib/lib/Tk.pm (autosplit into blib/lib/auto/Tk/Error.al) l ine 402 Tk::Error('MainWindow=HASH(0x953f240)','Can\'t call method "dispose" on unblessed reference at /usr/b...','main::save_selected at /usr/bin/artemis line 7971','[\&main::save_selected,k]','Tk callback for .menu1.menu.menu7','Tk::__ANO N__ at /usr/lib/perl5/site_perl/5.8.0/i586-linux-thr...','Tk::Menu::Invoke at /u sr/lib/perl5/site_perl/5.8.0/i586-linux...','(command bound to event)') called a t /usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/Tk.pm line 340 eval {...} called at /usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-mu lti/Tk.pm line 340 Tk::MainLoop() called at /usr/bin/artemis line 1785 -- Dr. rer. nat. Norbert Weiher (weiher@chem.ethz.ch) Institute for Chemical and Bioengineering - ETH Hönggerberg HCI E 117 - 8093 Zürich - Phone: +41 1 63 3 48 32