Trouble with Nextimages

any idea why this code isn't rendering the nextimages? I have a component that parses a directory filled with logos, and maps them all to nextimages, then in the page, I try to display them all, but I'm getting: The requested resource isn't a valid image for /home/machi/portfolio/public/logos/mail-clipart-mail-logo-3.png received text/html; charset=utf-8