🚀 go-pugleaf

I have a template created using FM 7. I have converted those templates into FM8 and then created a book. When I try to save the book as PDF, it gives the following error (in .txt format):
===========================================================================
%%[ ProductName: Distiller ]%%
%%[Page: 1]%%
%%[Page: 2]%%
%%[ Error: undefined; OffendingCommand: pdfmark; ErrorInfo: Rect ]%%

Stack:
/ANN
/Link
/Subtype
/G4.282834
/D
/GoToR
/S
/Action
/Type
-dict-
/Action
[0 0 0]
/Border
[1200 5218 9000 4955]
/Rect
-mark-

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

When I converted these FM8 files into FM7 and generated a book, I was able to save as PDF. I am able to save the individual FM8 files (using FM7 template) into PDF files.
Why am I not able to save the book as PDF, when I use FM7 template in FM8?