Running fastqc on trimmed reads

[tbazilegith]

Hi Fukasawa,
Is it not necessary to run fastqc on the trimmed reads?
I would like check if the quality has improved after trimming from longQC? (I tried fastqc, but it failed)
Failed to process sample_trmmed.fq.gz
java.util.zip.ZipException: Not in GZIP format
How do we check if the quality is better? ( can we run longQC again on trimmed reads)
Thanks,
TJ