[Bioc-devel] Windows error "UCSC library operation failed" in package karyoploteR

Hi all,

I've got a windows only error in one example of one of my packages (karyoploteR).

The erroring function uses rtracklayer::import to load some data from a BigWig file with
  
    wig.data <- rtracklayer::import(data, format = "bigWig", selection=plot.region[i])

where plot.region[i] is a GRanges.

The example used to use the example BigWig file from rtracklayer, but I changed it to
my own file to see if the problem was with the file itself. The error is exactly the same
with both files.

 From the error text I assume the problem might be related to reading
the data, is it correct?

Any idea of what might be failing?

This is the code of the example producing the error.

bigwig.file <- system.file("extdata", "BRCA.genes.hg19.bw", package = "karyoploteR")
brca.genes.file <- system.file("extdata", "BRCA.genes.hg19.txt", package = "karyoploteR")
brca.genes <- toGRanges(brca.genes.file)
seqlevelsStyle(brca.genes) <- "UCSC"

kp <- plotKaryotype(zoom = brca.genes[1])
kp <- kpPlotBigWig(kp, data=bigwig.file, r0=0, r1=0.3)

Warning in .local(object, ...) :
   Invalid argument
lseek(6, 232, invalid 'whence' value (4096)) failed
Error in .local(object, ...) : UCSC library operation failed
Calls: kpPlotBigWig ... mcols -> unlist -> summary -> summary -> .local -> .Call
Execution halted


Thanks a lot

Bernat