st: Error using -prvalue- in Stata 10 (unrecognized command: _pebase)

[Jn <ensam21@gmail.com>]

Hello Statalisters, I am having trouble getting -prvalue- command to
 work in Stata 10.0.
 After running my regression suppose I did:

 prvalue, x(married=1 female=1) rest(mean)

 then I would get the following error message:

 unrecognized command:  _pebase
 r(199);

 Has anyone come across this problem or Is it just me?
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