run segment check

I using 4nec2 to simulate patch antenna. After installed, I opened the bulid.exe then click create. But it shows that

What does this mean?

Do anyone have 4nec2 tutorials or example? Please upload. Thanks in advance.

I also need 4nec2 tutorials or examples!
Waiting for help.....
Best wishes!
Lu

Tutorial and many examples are all included in the 4nec2 v5.7.0 installation:

http://home.ict.nl/~arivoors/4nec2zip.zip

I followed the tutorial,But I did not add the "Add voltage source" yet,that is,new source-object is not displayed.Can you tell me why? Thanks a lot!

Added after 2 hours 20 minutes:

Dear VSWR,
I have another question.When I run 4nec2,jump the windows that show "Error or warnings found,run 'Segment check' " How can I solve this problem? And where I can find the error log?Can you give some suggestion?
Best wishes!
Lu