[gradsusr] error displaying the master ctl file

[vijay pawar]

the ctl file that i have created is

dset ^%imc%y2.nc
title SST, Pathfinder Ver 5.0, Day and Night, Global, Science Quality
(Monthly Composite)
options template
tdef 1 linear 12Z16MAY1998 1mn
xdef  3641  linear  0.0219727  0.0439453
ydef  1161  linear  -70.9937  0.0439453
zdef 1 linear 0 1
UNDEF -1+E07
vars 1
sst 1 -999 Sea Surface Temperature
ENDVARS

all these monthly composites i have downloaded them from
http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdPHsstamday.html

the ctl file gets opened but when i display the variable it gives an error

"Cannot contour grid - all undefined values"..can anyone please help
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