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[Caz]

Mason cancels Construct Building: Creature Occupying Site.

There's two spots where I'm trying to build walls on, and I repeatedly get this error though there's nothing on the tile. I tried re-designating multiple times, but it just gets to "almost completed" then it's suspended. If I un-suspend it, dwarves just mill around it forever.

The two tiles are at the entrance of the fort, the only empty spaces in the fortifications and wall. I uploaded a save..
http://download.file2you.net/fhx4kfpabgkc/

[Torak]

Does the mason have a pet?

[Caz]

quote:Originally posted by Torak:
<STRONG>Does the mason have a pet?</STRONG>

I have about 10 masons, none got it built.

[Toady One]

It won't let me download from the site on account of plugin something or other.

Anyway it's probably something like a persistent unit flag, and it would be difficult to tell from the save what happened anyway.  Do you remember anything unusual happening with creatures at that location?

[Caz]

quote:Originally posted by Toady One:
<STRONG>It won't let me download from the site on account of plugin something or other.

Anyway it's probably something like a persistent unit flag, and it would be difficult to tell from the save what happened anyway.  Do you remember anything unusual happening with creatures at that location?</STRONG>

Everything seems normal except for those two spots.   Sorry I can't help more

[veryinky]

Sometimes DF forgets to reset the occupied flag. Did you use any utilities like teleport?

[Caz]

quote:Originally posted by veryinky:
<STRONG>Sometimes DF forgets to reset the occupied flag. Did you use any utilities like teleport?</STRONG>

The only utility I use is regional prospector, though I don't see how that would have any effect.

[Fleeb]

I had this happen using 33b. There was a three tile bit of wall that wouldn't get built due to this error. The only unusual event right before I noticed it was an elven ambush, but that was at least two screens north of the wall location. No utilites were used.

[ March 03, 2008: Message edited by: Fleeb ]

[Exponent]

Just reconfirming this bug.  38c this time.  And like everyone else, I can't remember anything particularly unusual happening in this area.  It was a high trafficed area in the early part of my fort, when I had stockpiles and workshops on the surface, but all of that proceeded like normal.  Since that time, I've gotten immigrants, one of which is a hunter, so he's been killing stuff everywhere.  I've had no attacks; a snatcher came by once, but was scared off.

The only thing I can think of, and it probably has nothing to do with it, is after I got my first group of immigrants (spring 1052), I noticed while trading with the humans that summer that I had a few clothing items available that I never made.  I'm guessing it happened when I turned off hunting on one of the immigrants, because one of the items was a quiver.  I wouldn't have suspected that he would have dropped other various pieces of clothes, though.  Sorry, can't remember what they where; I never pay attention to clothes.

I have also smoothed a few boulders in the area, but most of those don't cause a problem, and only one of the five unbuildable squares has a smooth floor.  The other four are normal non-boulder non-smoothed squares.

[Exponent]

More information, including a work-around for those who need one.

First, it happens to be that it is precisely over an area where a trade depot used to be.  Not all 25 squares, but at least 6 of the 9 middle squares, but definitely not all 9 of them; at least one of those was fine.

Second, floors, stairs, bridges, and so forth can be built on these squares, but not wall, fortifications, et cetera, that block movement.  This is probably obvious, though.  And building a door there makes the door built in a stuck-open state.

Third, building a raising bridge over the area, and then raising/lowering it destroys the phantom creature, allowing walls to be built where they couldn't be previously.

Fourth, I was reminded (because it happened again while testing all this) that I once had a problem with auto-save backups with this fortress.  The game got stuck during a save on a season switch.  I just killed the program through the task manager.  The region1 folder and the region1-aut-1051 were not identical.  The -aut-1051 folder was missing the unit-3910.dat file, and the region1 folder's world.sav file was around 8K smaller than the region1-aut-1051 folder's.  I tried loading from the region1 folder, and all went well, so I didn't think much about it (just a sigh of relief).  I did save a copy of these two folders, though, in case it became relevant (and just confirmed that the backup, although slightly different, loads fine as well).  Let me know if they'd maybe be useful, and I can upload them somewhere.  They are before I destroyed the trade depot though, so it's before I found the phantom-creature-in-the-way bug.  I have separate saves for that.

[Toady One]

Yeah, all of those symptoms point at a misplaced/persistent unit occupancy flag.  Still no idea how it got there though.