计算S参量时出现的错误

我在计算S参量时出现这样的错误，请教高手怎么解决？
[error] Fast sweep setup, process abc3d : "WavePort1" mode 1 crosses cut-off in the specified fast sweep range.Consider splitting the sweep into multiple ranges.Use a port-only discrete sweep to locate the cut-off frequency. (9:42 上午三月 17, 2010)
[error] Simulation completed with execution error on server: Local Machine. (9:42 上午三月 17, 2010)

看上去可能是网格太密导致fast参数扫描报错，用离散参扫试试看。