Error running pipeline with Nextflow 0.32.0 about rnaseq HOT 8 CLOSED

task.memory ? "--limitBAMsortRAM ${task.memory.toBytes() - 100000000 : ''

ERROR ~ Error executing process > 'star (UHR_Rep2_ERCC-Mix1_1)'

Caused by:
  Not a valid memory value: null

Source block:
  prefix = reads[0].toString() - ~/(_R1)?(_trimmed)?(_val_1)?(\.fq)?(\.fastq)?(\.gz)?$/
  def avail_mem = task.memory == null ? '' : "--limitBAMsortRAM ${task.memory.toBytes() - 100000000}"
  seqCenter = params.seqCenter ? "--outSAMattrRGline ID:$prefix 'CN:$params.seqCenter'" : ''
  """
  STAR --genomeDir $index \\
      --sjdbGTFfile $gtf \\
      --readFilesIn $reads  \\
      --runThreadN ${task.cpus} \\
      --twopassMode Basic \\
      --outWigType bedGraph \\
      --outSAMtype BAM SortedByCoordinate $avail_mem \\
      --readFilesCommand zcat \\
      --runDirPerm All_RWX \\
      --outFileNamePrefix $prefix $seqCenter \\
  """