[BioC] Siggenes problem with sam.snp()

[Vincent Negre]

Hello,
I would like to use sam.snp() function from package
siggenes. But I get the following error:

> sam.out.snp <- sam.snp(data.cat.ok[1:100,],class,
B=100, na.replace = FALSE, check.levels = FALSE)
Erreur dans sort(unique.default(x), na.last = TRUE) : 
	'x' doit être atomique
De plus : Warning message:
There are 63 SNPs with at least one missing value. by
random draws from the distribution of the
corresponding SNP.  

There is a problem with sort(). Do you have any
solution?

Thank you in advance.
Vincent.