TANK Model - Steady State Results and Plot

Dear all,
I am very sorry to bother you, but I am new to dynare and I was trying to write down a TANK model based on Debortoli and Gali(2017), and to add a forward guidance shock. Attached you can find the codes. I find steady state values but some of them are very strange as Bonds (which should be zero in net supply and I get -4 instead).
Furthermore, the plot is completely flat, while it should show the exogenous shock which happens in period 20 but is announced today, and I cannot fine the mistakes.
Could someone help me?
Thank you very much in advance!

model1.m (255 Bytes) model1.mod (4.5 KB)

You should put resid before steady to see that there are a few equations with large residuals. You should focus on those.