Error: incorrect FASTQ format

[MrTomRod]

I tried to filter the raw data SRR14458708 from this paper.

Data download: SRA

Extraction:

$ docker run -v .:/data -it staphb/sratoolkit bash
(docker)$ fastq-dump -I --split-files SRR14458708

Filtlong:

$ docker run -v .:/data -it staphb/filtlong bash
(docker)$ filtlong --min_length 1000 --keep_percent 90 DZ2-SRR14458708_1.fastq 
Scoring long reads
  630513 reads (3002114721 bp)Error: incorrect FASTQ format for read DZ2-SRR14458708.630514.1

What does that mean?