error minimum intron length with hisat2 v. 2.2.1

[ConcettaDe4]

Hi!

I am using hisat2 v. 2.2.1 and I set the minimum intron size to 5. Unfortunately when I ran the command I got the following error:

--min-intronlen arg must be at least 20.

I was wondering how I can reduce the intron size.

Thanks for any help.

Concetta