I launched samtools to call SNPs on 2 BAM files, and when it comes to BCFtools, both returned an error.

    $ samtools mpileup -ugf refseq.fa aln.bam | bcftools view -bvcg - > var.raw.bcf
    $ bcftools view var.raw.bcf | vcfutils.pl varFilter -D 100 > var.flt.vcf

It returns the following error:

    [bcf_sync] incorrect number of fields (6 != 5) at 13:51289753

What does it mean? Can I just skip this error and keep going with my list of SNPs and indels?
So I found my way around the problem. When samtools hasn't finished running the output BCF files are truncated which triggered that error when I run BCFtools.