Table headings disappearing in pdf?

This is the message I get right now when I save to pdf. If I print to a prn, it doesn't open at all. I used to have a tool that converted the prn automatically at my old job, but there's nothing on the new job's computer and no IT help available. I've been doing a workaround by printing the TOC and the document separately and just adding the TOC to the new pdf, but now when I'm trying to pdf a large document (without TOC) that used to pdf just fine (with TOC), I'm getting the following message. I've just pdf'd chapters 7 & 8 with no problem whatsoever.

%%[ ProductName: Distiller ]%%
%%[Page: 1]%%
%%[Page: 2]%%
%%[Page: 3]%%
%%[Page: 4]%%
%%[Page: 5]%%
%%[Page: 6]%%
%%[Page: 7]%%
%%[Page: 8]%%
%%[Page: 9]%%
%%[Page: 10]%%
%%[Page: 11]%%
%%[Page: 12]%%
%%[Page: 13]%%
%%[Page: 14]%%
%%[Page: 15]%%
%%[Page: 16]%%
%%[Page: 17]%%
%%[Page: 18]%%
%%[Page: 19]%%
%%[Page: 20]%%
%%[Page: 21]%%
%%[Page: 22]%%
%%[Page: 23]%%
%%[Page: 24]%%
%%[Page: 25]%%
%%[Page: 26]%%
%%[Page: 27]%%
%%[ Error: undefined; OffendingCommand: pdfmark; ErrorInfo: Rect  ]%%

Stack:
/ANN
/Link
/Subtype
/M14.9.42153.Section.Title.Chapter.8.Installing.the.batteries
/D
/GoToR
/S
/Action
/Type
-dict-
/Action
[0 0 0]
/Border
[7305 2337 9000 2128]
/Rect
-mark-

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