problem about data acess compent in ads

Dear all,
There is a problem about how to sweep all values of a variable(AMP) in a .txt file. I used a DAC to read the file and the block was set as follows:type=discrete, interpmode=Index Lookup, Interdom=Rectangular,ExtraMode=Interpolation Mode,iVar1=1,iVar1=Index-1.
I also used a DC, which was set: SweepVar="Index",start=1, stop=6, step1.
when it is simulated, the error said :unsolved reference:Index.
the file:
BEGIN X
%Index AMP
1 0.1
2 0.2
3 0.3
.....
END X

Does anyone know how to solve this problem? Thanks.

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