请问HFSS仿真出现这个错误是怎么回事？

    [error] Adaptive solution setup, process hf3d error: Communication failure with child process 'eigen.exe'. (11:35:04 下午  十二月 14, 2011)
    [error] Unable to create child process: hf3d. (11:35:09 下午  十二月 14, 2011)
    [error] Simulation completed with execution error on server: Local Machine. (11:35:25 下午  十二月 14, 2011)
请大家帮忙解答一下，是不是我的模型太复杂了，网格设置的太密?

[error] hfsscomengine, process hf3d : Unexpected internal software error code 0 with module id 0.
[error] Unable to create child process: hf3d.
[error] Simulation completed with execution error on server: Local Machine.
----还有这个错误是什么意思，两个模型差不多，但是出得错误不一样，谁能帮我解答一下啊

兄弟姐妹们帮帮忙啊