HFSS simulation error: failure in processing solution for output.

I simulated a plannar arkimedes spiral antenna by HFSS. I used lumped port to excite the model. The model and the excitation are shown below. When I start simulation, the HFSS always breaked by the error report. I tried many ways to solve it, but I failed. Is there some people can help me to solve the problem? Thank you very much. I'm waiting for your replies.

The hfss error report:

I usually get that error when I'm out of disk space. How large is your simulation?

Thank you very much! Today, I found my C drive is almost full. Maybe this is the reason which caused the error. I will use other computer to simulate the model, and see whether it will occur the same error again. And again--thanks!

I have designed spiral antennas long back. It's difficult to solve by images to find the mistake. send your design to solve your problem.