[BioC] LIMMA - No residual degrees of freedom in linear model fits

[Ankit Pal]

Dear Group,
On trying to use the eBayes function, I got the
following error.

The steps are
>fit_NODS7 <- lmFit(MA_NODS7, design=c(1,1))
> fit_NODS7 <- eBayes(fit_NODS7)
Error in ebayes(fit = fit, proportion = proportion,
stdev.coef.lim = stdev.coef.lim) : 
        No residual degrees of freedom in linear model
fits

I understand that the residual degrees of freedom is
calculated by lmFit().
So why the error?
I tried looking up the bioconductor archives, but
couldn't find any reply that could help solve my
problem.
I used the same steps to analyse other datasets
without any problem.
I am using the R package version 2.0.1 on a windows
platform.
Hoping for a reply,
Thank you,
-Ankit