The comments at the beginning of the Aiyagari transition example are not consistent with the code: the comments talk about a change in \beta (discount factor) but the code changes \alpha (capital share)
Update
I found a bigger problem: the transition command does not run. I came back here after it failed while replicating Huggett (1997), please see my other post for the error message: Replication of Huggett (JME 1997)
Hi @aledinola, the Aiyagari transition fails on my setup with the same error message that you reported. Out of curiosity, I have checked the Guerrieri and Lorenzoni example and it breaks after computing the general equilibrium
Hi @javier_fernan, could you please check if in Guerrieri and Lorenzoni you get the same error message that I reported for Aiyagari and that refers to the transition? The GL example does fail, but the error is different: you have to add simoptions in a bunch of different places as last input to some functions. If you are interested in that, I suggest you open another post to flag this error to @robertdkirkby. Sorry Rob, more work for you 
Fixed (and uploaded a new cleaner version of Aiyagari1994TransitionPath file, including correcting the comments).
I was doing a few changes to infinite horizon transition paths in December, substantial improvements. But all my examples use grid interpolation layer and divide and conquer so I didn’t realize I had some typos when those are not used. Cleaned them up now 