Error on command Sort on linux

[ozwin pais]

Hi ,

We  have RHEL 4( Linux 2.6.9-22.ELsmp) installed  box. when we execute sort
-z 65536  filename its giving error please find below.
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# sort -z 65536 geo_panelist
    /NOPRODUCTID
 /silent
 /infile geo_panelist 65536
 /keys   1
 /outfile -
 \
                                                 ^
DMExpress : (PRLOR) record length value is out of range
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Could you please help us to resolve this issue.

Thanks and Regards
Ozwin.