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[Reese]

I came across this last night while building some fluid logic gates.

I had dug out and built a repeater and a signal inverter and was attempting to link the bridge in my signal inverter to my repeater, which I had built and tested earlier.  I was able to select the pressure plate in my repeater and choose add new task and to connect it to a bridge, but when I hit enter to select the bridge it gave me the error message "You don't have enough mechanisms." despite the fact I had a small stockpile with four mechanisms

Because I'd been testing the repeater, there was 5/7 water in the room, and once I recruited a dwarf and made him stand in the door so the water could drain out I had no problem setting up the linkage

Here's what my setup was and the error message. 

Spoiler (click to show/hide)

I'm using 40.d14, and I do get the same error message in vanilla DF extracted to a new folder with region file copied from what I'm using.

I didn't find this when I searched mechanism in the bug list, so I don't think it's there, didn't really loog beyond the first three or four pages in this forum.

[shadowform]

I think 5/7 is enough that dwarves won't path through it, and most things that use mechanisms check only for mechanisms that there's a path to.  If you want to test this, wall off a section of fortress and then try to use a supply outside the sealed area while inside the sealed area.  It won't (or shouldn't) show up on the list as available.

[Reese]

Hmm, that makes a lot more sense.

Though The water level might have been slightly lower, as this is a screenshot that I took today, it still would have been greater than four.

It took me until I'd subsequently hooked up the nine vertical spikes I'd built so far before I realized that it was the water flooding the plate causing the error, but I guess that's me being obtuse rather than a bug.  I think most of the other errors of this nature say something like "no path" or "item inaccessible", right?

[Footkerchief]

I think most of the other errors of this nature say something like "no path" or "item inaccessible", right?

Of this particular nature, no.  Those tend to happen when a dwarf was already heading for an item that suddenly becomes inaccessible due to a map change.

It might be helpful if the game told you how large an area had been searched for items -- a low number would clue you in that there was an accessibility issue.