You wouldn't happen to have tried to cheat Rachel's trust, would you? Because it's trying to call a function called r_attr.set_trust, but it's not a function, it's an int. There was a bug with Liza's corruption that did this, but nothing with Rachel's trust on day 9.
Open the console and type
r_attr.set_trust
Does it spit out a number? If so, the function has been overwritten by an integer value. Fortunately, the fix is easy. Shamelessly stolen from
@Penfold Mole 's fix for a similar Liza bug.
type:
del r_attr.set_trust
r_attr.set_trust
It should spit out some gobbledy gook that starts with "<bound method"
From now on (with this save) it will work.