then there is something in your document which might be causing the issue...
try and isolate the problem by hiding the layers first ,
ex:- you have 2 layers then hide one and check bu making pdf , if it works then the issue is in that layer which is hidden
once you wll find the layer you can locate the object on the layer causing this issue.
and Is it possible to share the file ....
instead of the layering in pdf now i imported the seperate layers as layers in InDesign. Exporting works fine now, so the failure was made because of the layered pdf
As far as I know there is nothing inherently problematic about using layered PDFs and exporting, so this may be a problem with that particular PDF file.
Are you patched to 7.5.2?