Fastx Trimmer : invalid sequence

[Oliviervg]

Hi everybody,

I clipped my data (PE 2*76bp Illumina) with

fastx_clipper -i s_1.fastq -o s_3_m50.fastq -l 50 -Q 33 -v
and it seems to work.

Then I want to trim my data with
fastx_trimmer -i s_1_m50.fastq -o s_1_m50_trim10_500.fastq -f 11 -l 500 -m 50 -Q 33 -v

and I get : fastx_trimmer: Error: invalid quality score data on line 124756 (quality_tok = "CCCFFFFFHGHHHJJJJJJJJII"

I'm using : FASTX Toolkit 0.0.13

Does anyone have an idea why I got an error ?
Thank you