Assertion failed on plan_construct.cpp

[GothThot]

The AI worked fine on the first fortress in the world I am currently using. I wanted to retire the fortress and start another one using another dwarven civ, but when I enable the ai it crashes. Using every scenario I can think of, letting the ai select the site itself, selecting the site for the ai and then enabling it, still end up with the same result. It works fine if I unretire the old fortress. Here's the error code in the debug log that has appeared after every crash.

df-ai debug log opened. version information follows:
Dwarf Fortress 0.47.04
Windows 64-bit
df-ai 0.47.04-r3-0-g1ef41ab2
code 1ef41ab
DFHack 0.47.04-r3-0-gb343d008
library b343d008004717f3c70de106bbf19106ae8c8f5c
structures 00549aca0640ca121c20734df667f79b247c93b4
Assertion failed on plan_construct.cpp line 1236: bld
newly created civzone is missing!