Show better errror message on sample problem
Show better errror message on sample problem

pjotrp/bioruby-vcf,gusevfe/bioruby-vcf,gusevfe/bioruby-vcf,pjotrp/bioruby-vcf,CuppenResearch/bioruby-vcf,CuppenResearch/bioruby-vcf,gusevfe/bioruby-vcf,pjotrp/bioruby-vcf,CuppenResearch/bioruby-vcf