PPL+ error: Unable to read "default.spk"

[<arv@xxxxxxx>]

Hi All,

After upgrading my Ferretv5.4 to v5.5 I have the following problem:

[antonio@EQ16 nc]$ ferret
        NOAA/PMEL TMAP
        FERRET v5.50
        Linux 2.4.3-12smp - 01/15/03
        27-Jan-03 11:46

yes? use sst_rey.nc
yes? set region/x=7w/y=37n
yes? plot sst

 PPL+ error: Unable to read "default.spk" to set shade and fill colors.

Cannot find OLD file
Program terminated by fatal I/O error
Aborted
What do I need to fix?

Thanks in advance

Antonio