Constructing a house bug Cannot be placed here

So i tryed everything even if the land was flatened enough there was that Could not build here then i tryed to dig it up and put it down again same thing, covered in stone? same thing,dug the stone again? same thing ,here are the screenies
N1: the placement position

N2: this is the error in the down corner left i get

N3: this is how flat the land it is with enders client

Is the biome that is bugged? or it has to do with the chunk im in?
if you want further information/testing i can do it for you devs just ask for it
Before you start saying that i dont have enough black bile i dont think that more than 20 black bile is required since i have more and on other places the sign can be put down
N1: the placement position
N2: this is the error in the down corner left i get
N3: this is how flat the land it is with enders client
Is the biome that is bugged? or it has to do with the chunk im in?
if you want further information/testing i can do it for you devs just ask for it
Before you start saying that i dont have enough black bile i dont think that more than 20 black bile is required since i have more and on other places the sign can be put down