Is it possible to send a save game somehow? does it happen a any new game?

built on hills*

@rui That's not it. I ensure this is built on mountains and within 3 tiles of my city and still no good. I believe this is broken. :(

Got it, is for any distric that you trying to add to fourth layer, here the reason:"You can only build districts in a 3 tile radius around your city, and that tile is 4 tiles away. As a side note, almost everything else to do with cities respects the three-tile distance: working tiles, buying tiles, placing wonders, and culture bombing (because it adds tiles to the city)."

I dont know of this error, I will try to check it out, thanks for the feedback

Where can this district be placed? I understand it must be placed on hills tiles but I get a message that this tile selection is "too close to a city".