Error executing process > 'MARKDUPLICATES (1)'

Caused by:
  No such variable: id -- Check script 'modules/local/markduplicates/main.nf' at line: 44


Source block:
  def prefix = task.ext.prefix ?: "${meta.id}.md"
  """
  touch ${prefix}.bam
  touch ${prefix}.bam.bai
  touch ${prefix}.metrics
  
  cat <<-END_VERSIONS > versions.yml
  "${task.process}":
      gatk4: 4.5.0.0
      samtools: 1.19.2
  END_VERSIONS
  """

Tip: when you have fixed the problem you can continue the execution adding the option `-resume` to the run command line