update:
I think one the problems is that I had a different version of Lazarus installed before, I think I might have some hidden files interfering with the new version and this could be a reason why I'm encountering this error.
I've decided to RESET my mac and I'll try to install everything all over again, just to have a clean machine to try on.
I'll post the update if I succeed (mods delete this thread if you think is not relevant)