R help - Jun 2007 - initial value for optim in polr question

Hi,

I have a problem with initial value for optim in polr that R report. After a
call to polr, it complains that:

Error in optim(start, fmin, gmin, method="BFGS", hessian= Hess, ...) :
initial value in 'vmin' is not finite.

Would you please suggest a way round to this problem? Thank you so much in
advance.

Rgds,

- adschai