unformatted file write error

I got the following error messeage. What is causing the problem?

PGFIO/stdio: File too large
PGFIO-F-/unformatted write/unit=110/error code returned by host stdio - 27.
In source file WQM_022403_minmax_sed.f, at line number 850

I forgot to use -Mlfs switch. Problem solved.