[gradsusr] error opening multiple files

[HIMA BINDU]

Dear Sir / Madam,
                                 I am getting an error while handling with two control files in one script and the error is
cannot contour grid - all undefined values
cannot plot color bar: No shading information
Entire grid undefined

Here is my script
'reinit'
'clear'
* These are the BLUE shades
'set rgb  16    0    0  255'
'set rgb  17   55   55  255'
'set rgb  18  110  110  255'
'set rgb  19  165  165  255'
'set rgb  20  220  220  255'
* These are the RED shades
'set rgb  21  255  220  220'
'set rgb  22  255  165  165'
'set rgb  23  255  110  110'
'set rgb  24  255   55   55'
'set rgb  25  255    0    0'
'open testone.ctl'
'open testtwo.ctl'
'set dfile 1'
'set grads off'
'set xlopts 1 2 0.15'
'set ylopts 1 2 0.15'
'set t 289 1153'
'set lev 1000 30'
'set lat 15'
'set lon 92'
'set gxout shaded'
'set clevs -20 -15 -10 -5 0 5 10 15 20'
'set ccols 16 17 18 19 20 21 22 23 24 25'
'define uave=ave(u,t=289,t=1153)'
'set dfile 2'
'set grads off'
'set xlopts 1 2 0.15'
'set ylopts 1 2 0.15'
'set t 289 1153'
'set lev 1000 30'
'set lat 15'
'set lon 92'
'set gxout shaded'
'set clevs -20 -15 -10 -5 0 5 10 15 20'
'set ccols 16 17 18 19 20 21 22 23 24 25'
'define ubar=u.2-uave'
'd ubar'
'run cbarn.gs'
'draw title "Zonal wind perturbation"'
'printim uprime.png white'

Can anybody help me please...

Thanks & Regards
Hima Bindu
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