Added object refence to error message.
Added object refence to error message.

darcs-hash:20081123113042-86a4e-0f3e363de827a94c222fe16b038b9c2ea6768a99.gz

nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf