problem in converting to PDF

Hi,

i am facing a strange problem while converting the book file to pdf...
Error message:

%%[ ProductName: Distiller ]%%
%%[Page: 1]%%
%%[Page: 2]%%
%%[ Error: ioerror; OffendingCommand: readstring ]%%

Stack:

(====;;;;;;::::9998877755554444222222222-\)&# ...)
-file-
-mark-
-save-

%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%
%%[ Warning: PostScript error. No PDF file produced. ] %%

I think its with the encapsulated post script files I use in the book.
please help me to resolve this issue...

Thanks...