Players can't build, pillars falling

Hey, guys, I run a modded server and from the last update I have a problem with buildings…people can build the foundation but after that pillars and walls are falling down …and now they can t even place Cupboard or whatever stuff on the ground.
Anyone else with this problem?
can’t place: failed check: isinarea http://(wall.low/sockets/floor/area_test)
players can t build anything on the server…the pillars all falling down from the first floor