R help - Aug 2006 - Negatie Binomial Regression: "Warning while fitting theta: alternation limit reached"

I am fitting a negative binomial regression model to some count data. I
chose the negative binomial b/c the variance is greater than the mean.
Anyways, when I fit the model I get the following warning: "Warning while
fitting theta: alternation limit reached" The estimate that I end up with
is
very large (1070), and the standard error is even larger (1276). Does this
indicate that I should not be using glm.nb? Is there anyway to remedy the
problem,i.e. increase the number of iterations allowed?

thanks,

Spencer

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