Error in Model "The macroeconomics of trend inflation"

I am replicating the model of the paper “The macroeconomics of trend inflation”. But i found an error
in the ‘steady_state’ block, variable ‘A’ is undefined in the declaration of variable ‘A’ >mod is attached.
Asif.mod (20.8 KB)

This a mod-file I have written. You should read the instructions more carefully. As it says on my homepage, you need the Dynare unstable version.

It is done.