Please, help to compile "\cfrac".

Thank you for your time
-- 
Leonid Baranov

Description:
============

When used in a displayed formula, a chained fraction
is properly rendered by the LyX GUI.

When I try to obtain PDF (pdflatex), LaTeX fails to compile.

Latex Errors Log:

! Undefined control sequence.
<argument> 1+\cfrac 
                    {(S-1)}{2}
l.95 ... \frac{1}{2}\,\frac{1}{1+\cfrac{(S-1)}{2}}
                                                  \nonumber \\
The control sequence at the end of the top line
of your error message was never \def'ed.
...

Details:
========

My platform:
 Windows Vista 64 bit
LyX installation used:
 LyX-1661-4-24-AltInstaller-Complete.exe
LyX version:
 1.6.6.1(May 28, 2010), Windows
Document class:
 article (REVTeX 4)
Class options:
 Predefined (aps, manuscript)
Math Options: (Default):
  Use AMS math package automatically
  Use esint package automatically
LaTeX Preamble:
  Empty


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