In my store approximately 16,000 products are there. When I try to export both ways import/export or dataflow, both show error. But when I export less amount of data (say 200-300 products at a time), I am able to export my products. Which means I can't able to export all my products at a single file.
System > Import/Export > Export error:
System > Import/Export > Dataflow profiles > Export all products error:

