Index.log - could not open document

Question

I get error when indexing a folder.
The document with the problem is named: document.pdf
Other documents in this folder works fine.
The  index.log tells:
Could not open document: W:\Doc\document.pdf-Press Quality.joboptions
This file is skipped in the created index.
What is the problem?
I tried to regenerate the pdf - still the same problem.
Is the index process looking for the joboption file when doing the indexing job?
It's a kind of weared as I use this Joboption in other documents without problem.
I use software:
Frame Maker 10.
Adobe Acrobat X Pro.
Windows 7 Enterprise 64 bit.

Answer 1

Hi Bill!
Thanks.
My version was 10.0.x
I now updated to 10.1.13. This did not help.
How I get there in the first place?
I work at a company that develops and manufactures machines and systems.
My job is to produce instruction books, manage and distribute all documentation (manuals, diagrams etc.) to our customers. 
This is done by gathering all pdf-documents (wiring diagrams manuals etc.) in a doc-folder (documents are contained in sub folders), linking these documents in a master-page (main menu). (Documents in the folders includes pdf documents from other suppliers.)
When all this is done, I create an index for all documents in the  doc-folder. Then connecting this index to the master page.
This makes the entire documentation set searchable from the master page.
Normally, this works just fine.
But not for this this document.
I just do not understand what the error actually means.  
Could not open document: W:\Doc\document.pdf-Press Quality.joboptions
This "document.pdf" is an instruction manual that can be opened as any other pdf file.
More ideas are very much appreciated.