hfss error

hi all,

i'm trying to simulate the spiral antenna with hfss v11. at first, that was ok, but then when i changed the parameter, i've got this kind of error

adaptive solution setup, process hf3d error:matrix solver exception: file I/O failure...

what does that mean?

and why i need 5-6 hour for each simulation?

Thank you.

Did you get this to work out? I am having similar problems with a ring slot antenna. Sorry I couldn't pm you, this is my first post.