Error: Illegal label 'Rand[data.ID,1]' detected in matrix 'A'. Square brackets must contain numeric literals when used inside of

Hi,

I met with the error when I was running a Random Coefficient model:

Error: Illegal label 'Rand[data.ID,1]' detected in matrix 'A'. Square brackets must contain numeric literals when used inside of labels.

So, can we use the definition variable inside of the square brackets? Or maybe there is something wrong with my script. The related script is as below, and the variable ID is numeric (1:100).

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RandVals <- matrix(c(-0.2, -0.2), numSubjects, 2, byrow=TRUE)
...
...
...
mxMatrix("Full", nrow=numSubjects, ncol=2,
values=RandVals,
free=TRUE,
name="Rand"
),
mxMatrix("Full", 6, 6,
values=c( 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
-.2,-.2, 0, .1, .1, 0,
0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
.1, .1, 0,-.2,-.2, 0),
labels=c( NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA,
"Rand[data.ID,1]","zetaX", NA,"gammaYX","gammadYX",NA,
NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA,
"gammaXY","gammadXY", NA, "Rand[data.ID,2]","zetaY", NA),
free=c( FALSE,FALSE,FALSE,FALSE,FALSE,FALSE,
FALSE,FALSE,FALSE,FALSE,FALSE,FALSE,
FALSE, TRUE, FALSE,TRUE, TRUE, FALSE,
FALSE,FALSE,FALSE,FALSE,FALSE,FALSE,
FALSE,FALSE,FALSE,FALSE,FALSE,FALSE,
TRUE, TRUE, FALSE,FALSE, TRUE, FALSE),
...
...
...