fluent15.0调用nist时提示：系统找不到指定文件怎么回事?

本人按照fluent帮助文件加载nist，遇到如下问题：输完相应的指令后，系统提示找不到指定文件，具体错误信息为
/define/user-defined/real-gas-models> nist-real-gas-model
use NIST real gas? [no] yes
系统找不到指定的文件。

Opening library "Drogram FilesANSYS Incv150fluentfluent15.0.0
ealgas"...
Library "Drogram FilesANSYS Incv150fluentfluent15.0.0
ealgaswin64librealgas.dll" opened

Material real-:
  Changing method of "Density" to "constant" -- data required.
  Changing method of "Cp (Specific Heat)" to "constant" -- data required.
  Changing method of "Thermal Conductivity" to "constant" -- data required.
  Changing method of "Viscosity" to "constant" -- data required.

Setting material "real-" to a real-gas...

Error:  received a fatal signal (Segmentation fault).

Error:  received a fatal signal (Segmentation fault).
Error Object: #f

/define/user-defined/real-gas-models>