[ferret_users] How to fix error in reading hdf data?

[cshaji@xxxxxxxxxxxxxxxxxxxxx]

Dear All:
I am trying to read an hdf sst data file in Ferret. I get the following error.

yes? use "/work/data/sst/dataver5/198510.s04m1pfv50-bsst-16b.hdf"
 **netCDF error
             NetCDF: Unknown file format (OPeNDAP/netCDF Error code -51)
             Data set: /work/data/sst/dataver5/198510.s04m1pfv50-bsst-16b.hdf

What is Error code 51 means and how to fix it in Ferret?

Can somebody give me a good suggestion?

Regards

Shaji.