"A building lacks a path to the citadel"

[nobody]

Not sure if this is a bug. Likely I'm missing something. I started getting "a building lacks a path to the citadel" message. It's not clear which building. I didn't do anything that should have broken a path. And I've scanned the whole map, even clicking all the obvious suspects, and they all seem to have a path. But honestly, I'm not sure what all needs a path. Resource gatherers only? Nobody is standing around that I can see. Anyone else get this?

[Llyes]

does clicking on the message take you to the building in question? every building aside from modular walls/staircases requires a path to the citadel

[nobody]

Update. Clicking does zoom to building. But it's not easy to tell which building is intended. I was assuming it was either a sawmill or quarry. By zooming all the way in before clicking, it becomes obvious which building is involved. And...it was a beacon. Which is odd, because I didn't change anything about the beacon to make it start complaining. Anyway, I destroyed it and moved it over two squares and it's fine.

[Llyes]

Originally posted by nobody:

Update. Clicking does zoom to building. But it's not easy to tell which building is intended. I was assuming it was either a sawmill or quarry. By zooming all the way in before clicking, it becomes obvious which building is involved. And...it was a beacon. Which is odd, because I didn't change anything about the beacon to make it start complaining. Anyway, I destroyed it and moved it over two squares and it's fine.

you likely changed something closer to the citadel which obstructed its path, or it wasn't fully built yet or something

[Zaris]

Originally posted by nobody:

Which is odd, because I didn't change anything about the beacon to make it start complaining.

There are multiple reasons:
- you destroyed another beacon / moved it so it's influence area doesn't reach the current beacon anymore -> try to build a new beacon to check the area if it still overlaps with the problematic beacon
- you blocked the way from the beacon to the citadel by accidentically closing a "gap" it needed, happens quite easily if you place to many buildings or walls without doors
- you recently redesigned a defense wall with a needed doorways and suddenly the door is not usable anymore, happens easily if you don't leave 2 blocks high of space in your wall structure with the door or build the door right beside a slope -> build doors in walls ideally on "even" floor with 2 tiles high space
- you had a doorway in a wall but to reach it you had to build stairs in front of it which got destroyed by an enemy -> path blocked -> build doorways ideally without the need of stairs in front of it

For buildings with workers likes sawmill, quarry it's a bit easier to see if they're blocked because when they have a clear way to the citadel / warehouse a stonefloor will appear and vanish as soon as their paths are blocked.