[solved] Blank js, css file after upgrade VPS and litespeed licensce

Hello, after upgrade license from Ultra to 1 CPU License: all my css, js file was blank (but I can see its content via ftp)
and I switch to Apache, everything's ok.
I tried to delete cache, restart litespeed, reboot vps, reinstall litespeed but no hope.
any idea?
Just solved with tip by Ruikai Wang at LiteSpeed (on slack)
But I think I should leave it here and may be useful for someone
The solution: Clean files inside `/tmp/lshttpd/swap`