(4nec2) errors what do they mean?

I receive the following errors and I don't know what they mean. I am currently working with 512MHz, but I also want to complete frequency sweep of 30 - 512 MHz

Warn.: Wire 17 (tag 18), seg-len ( (0.109) ) above wlen/10 (0.059)
Error: Wire 18 (tag 19), seg-len ( (0.361) ) above wlen/5 (0.117)
Error: Wire 19 (tag 20), seg-len ( (0.361) ) above wlen/5 (0.117)
Error: Wire 19, seg 423 (tag 20), seg-len (0.361) differs more than 5 * seg-len (0.069) for wire 2
Error: Wire 20 (tag 21), seg-len ( (0.361) ) above wlen/5 (0.117)

What is "seg-len"? I know wlen/5 is 300/512 = .5859meters/5 = .117

How can I choose the correct segment length? I am building a discone antenna

Thanks