Dear IFEFFIT folks, Hello, I've been on the mailing list for a long time. It's really helpful for the advice from every expert. I have a problem about data input into Athena. When I want to input my experimental data, Athena replied the cord said that: ############################################################ Use of uninitialized value in subtraction (-) at athena line 2828, <F> line 1. Tk::Error: wrong # args: should be ".frame3.frame.canvas bbox tagOrId ?tagOrId .. ...?" at Tk.pm line 228, <F> line 1. Tk callback for .frame3.frame.canvas [\&main::read_file,0] (menu invoke) ############################################################ and I caanot input my data in to Athena. Is there anyone happens to know this problem? Thank you! Good day Yu-Chuan Lin