When loading my custom Story gives me Error!

[sacroid]

My Custom Story was working great until now. I have 3 levels done for it, but just after fixing something in the first level (changed path node areas of a monster) now gives me an error:
There is no Disk, please Insert a disc in \Device\Harddisk4\DR4.

What can I do? :S

EDIT: Nevermind, I alredy fixed it xD

[mastersmith98]

Could you post what was wrong and how you solved in case others run into the same problem?