[gradsusr] Display error

[Miles Bliss]

This is the line of code i am trying to run.
'set lon -90 -70'
'set lat 35 45'

'c'
'set grads off'
'set gxout shaded'
'set lev 925'
'd
(hgtprs+hgtprs.2(time=00z18jan2002)+hgtprs.3(time=00z11jan2003)+hgtprs.4(time=00z07dec2005)+hgtprs.5(time=00z04dec2007)+hgtprs.6(time=00z08feb2007)+hgtprs.7(time=00z29dec2009)+hgtprs.8(time=00z20feb2009)+hgtprs.9(time=00z07dec2010)+hgtprs.10(time=00z01feb2010)+hgtprs.11(time=00z16jan2011)+hgtprs.12(time=00z01jan2013)+hgtprs.13(time=00z12dec2013)+hgtprs.14(time=00z19nov2014)+hgtprs.15(time=00z06jan2014)+hgtprs.16(time=00z29jan2014)+hgtprs.17(time=00z06feb2014))/17'
*+hgtprs.18(time=00z08feb2014)+hgtprs.19(time=00z30dec2014)
'run cbar'

This is therror that i am getting despite having the correct file
dates/times and all files working individually.

Data Request Warning:  Request is completely outside file limits
Data Request Warning:  Request is completely outside file limits
Data Request Error: Invalid grid coordinates
  World coordinates convert to non-integer  grid coordinates
    Variable = hgtprs.18  Dimension = 3
  Error ocurred at column 465
DISPLAY error:  Invalid expression
  Expression =
(hgtprs+hgtprs.2(time=00z18jan2002)+hgtprs.3(time=00z11jan2003)+hgtprs.4(time=00z07dec2005)+hgtprs.5(time=00z04dec2007)+hgtprs.6(time=00z08feb2007)+hgtprs.7(time=00z29dec2009)+hgtprs.8(time=00z20feb2009)+hgtprs.9(time=00z07dec2010)+hgtprs.10(time=00z01feb2010)+hgtprs.11(time=00z16jan2011)+hgtprs.12(time=00z01jan2013)+hgtprs.13(time=00z12dec2013)+hgtprs.14(time=00z19nov2014)+hgtprs.15(time=00z06jan2014)+hgtprs.16(time=00z29jan2014)+hgtprs.17(time=00z06feb2014)+hgtprs.18(time=00z30dec2014))/18

-- 
-Miles Bliss
 SUNY Brockport '17
 Meteorology
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