Error executing process > 'library_merge (Body 188)'

Caused by:
  Process `library_merge (Body 188)` terminated with an error exit status (1)

Command executed:

  samtools merge Body 188_udgnone_libmerged_rmdup.bam SRR6263249_rmdup.bam SRR6263255_rmdup.bam
  samtools index Body 188_udgnone_libmerged_rmdup.bam

Command exit status:
  1

Command output:
  (empty)

Command error:
  [E::hts_open_format] Failed to open file "188_udgnone_libmerged_rmdup.bam" : No such file or directory
  samtools merge: fail to open "188_udgnone_libmerged_rmdup.bam": No such file or directory