How to use stimulusFile in Ocean Script

Hi there,

I got a question when using Ocean Script. I wrote a script and it works fine for one stimulus file like below,

simulator( 'spectre )
design(...)
resultsDir( ...)
modelFile( ...)
out=outfile("..." "w")
stimulusFile("tb_1.txt" ?xlate nil)
for( cntrl 5 7
analysis('tran ?stop "30n"  )
desVar(  "vdd_adj" 1.0+0.1*cntrl)
envOption(
'analysisOrder  list("tran")
)
save( 'i "/V3/PLUS" )
temp( 27 )
run() 
...
)
...

If I change the stimulusFile statement into ("tb_2.txt" ?xlate nil) , I will also get the good result.But when I use For Loop, some errors happened, like

for(i 1 2
stimulusFile(sprintf(nil ".../tb_%d.txt" i) ?xlate nil)
... 

ERROR (SFE-401): "/homes/grad/lw-1022/cadence/lab2/tb_1.txt" 126: Duplicate
instantiation of `V9' in `top-level'.

ERROR (SFE-401): "/homes/grad/lw-1022/cadence/lab2/tb_1.txt" 127: Duplicate
instantiation of `V8' in `top-level'.

....

-------------

In netlist, I intentionally remove some lines such as

V127 (B\<3\> 0) vsource type=pulse dc=1.800000e+00 val0=0 val1=1.800000e+00 period=20n delay=5n rise=100p fall=100p width=10n

V126 (B\<4\> 0) vsource type=pulse dc=1.800000e+00 val0=0 val1=1.800000e+00 period=20n delay=5n rise=100p fall=100p width=10n 
......

and copy these lines into some stimulus files (tb_1.txt and tb_2.txt) with different values. I just want to use these different stimulus files to simulate different condition (just different delay). But it can't work at all. Can somebody tell me why this happened? What should I do if I want to use different stimulus files with For Loop and get correct results? I even don't understand how stimulusFile works.

Regard,

Wayne.