scanBam(bam, range(IGHVDJ_granges), cellBarcodeTag = cellBarcodeTag, :    Failed to fetch any alignment in the given genomic region. Are you sure you have indicated the correct BAM file and/or genomic region?

Thank you for your wonderful R Package ,but we  produce our bam file with Cell Ranger multi Filtered Outputs and only have concat_ref.bam which is not suitable  for your r package requirements,what should I do?