I am using the fastx toolkit to get the reverse complement of fastq files that are in Sanger phred 33 format. I need to add the -Q33 flag, as discussed in this previous BioStars post Fastx Invalid Quality Score Value . However, I am getting the following error:

fastx_reverse_complement: Error: invalid quality score data on line 1464 (quality_tok = "+"

The "+" symbol on this line is a low scoring phred 33 symbol, not the "+" that separates sequence lines from symbol lines. The fastq files were generated from PacBio, which are in Sanger 33 format. I don't know why it is not being recognized or accepted. Any insights on how to overcome this? Thanks