RBC wrong IRF

Hi guys, I’m working on a very simple RBC model (you can find the paper attached). I wrote the .mod file but i get very strange IRF and can’t understand where the error is. Would you give it a quick look please? Shouldn’t take long for you to find what’s wrong. Thanks a lot
classthree.mod (940 Bytes)
On Class Three.pdf (151 KB)

What is the problem? For me everything seems correct.