failed to convert from cram to bam (parse error CIGAR character)

In order to convert a bioinformatic file from CRAM to BAM format, I naively used the samtools command available on a cluster but got this error:

After a few commands trying to fix the issue, I realised that the error message contained the SAM label. This indicates that samtools version is a bit old. And indeed it was. I then used version 1.6 of samtools and it worked out of the box.

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