cintro Errors "sceIoOpen() failed!"

[Nitrous]

I recently tried making my own cintro but because I was bored with the one I had, but whenever I try to load it it says "sceIoOpen() failed!" I googled it and found the same thing saying "Make sure it's in the right folder and that it's named intro.pmf or cintro.pmf" I gave it the same filename as my old one (cintro.pmf) and put it in the same folder but it just gave me a black screen. Then I tried renaming it to just intro.pmf it gave me the error again. What do I do? I run on 5.00 m33 CFW and AutoBoot to load my cintros

[Mr. Shizzy]

Use a plugin called "AutoStart Plugin" by Roe-Ur_Boat

[Anonymous Blah]

or try disabling CXMB

[Nitrous]

Actually it is autostart, not autoboot. I was tired when I posted that. Also turning off CXMB didn't help. I've even tried remaking this cintro like 3 times.