[BioC] No convergence in li wong fit

[Ann Hess]

When using the Li Wong algorithm in Bioconductor (specifically,
  liwong<- expresso(data,normalize.method="invariantset",
 	bg.correct=FALSE,pmcorrect.method="pmonly",summary.method="liwong")

I got the error:
No convergence acheived in outlier loop in : fit.li.wong(probes,...)

I understand that this algorithm will fail to converge for some probe 
sets, but is it possible to find out WHICH (or how many) probe sets failed 
to converge?

Ann Hess