ORCAD仿真求助

各位DX好，本人现在用ORCAD仿真，仿真文件很简单，就是一个BUCK电路，遇到一个问题，问题提示如下：

WARNING -- Library file C:\Cadence\SPB_16.3\tools\PSpice\Library\infineon.lib has changed since index file nom.ind was created.
WARNING -- The timestamp changed from Thu Jun 21 17:50:36 2007 to Mon Jan 04 11:42:56 2010.
Making new index file nom.ind for library file nom.lib
ERROR -- Unable to open index file C:\Cadence\SPB_16.3\tools\PSpice\Library\nom.ind. Refer to 'How PSpice uses model libraries' section of pspug.
ERROR -- Unable to make index for library file C:\Cadence\SPB_16.3\tools\PSpice\Library\nom.lib

不知各位有没有遇到过类似问题，怎么解决的呢？以前用SABER, 刚转到ORCAD, 用起来还真是不顺手。
请各位DX指点，谢谢！