Material properties with number of iteration CFX

I am trying to set up a simulation where I investigate the effect of different fluid properties, for example, density. This is why I would like to find a way to change density with the number of iterations. Currently, I have made an expression and user function. The expression is for density

which depends on the iteration number (user functions)

, then I have defined a new material using the density expression

.but the CFX shows me the attached error

. I previously tried this method with boundary condition as velocity and it worked perfectly.

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