NEC-LIST: Geometry Limitations in NEC-2

Hello Folks !
   These days I was puzzled with the Geometry Limitations in NEC-2.
   I used 4nec2 to modeling,and I got the warnings as follows,

   Warn.: volumes for Wires 8 (tag 8) and 16 (tag 16) are intersecting.
   Warn.: too sharp angle or too short/thick segment(s) for Wires 10
(tag 10) and 11(tag 11)

    I don't know how to avoid these.
    Could you please tell me where I can learn more about the details
on Geometry Limitations.
   Any resources on Internet will be OK. Thank You !

Best Wishes

-- 
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Zhenhua Cai,
School of Computer Science,
China University of Geosciences,
Wuhan, 430074, China
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