Yep, I am not going to risk just looking at the config file for v9 and hoping it works, as I do not know what else changed. An upgrade guide somewhere - or even just a reference that if you conform the config file from 8 to 9 will work - would be great.

Mine failed because a number of keys in my config are not there (in my case relative_path was not in my config), but in looking at my v8 config to v9, there are many other keys in the v9 code that seem to be required now.