I have Stable at lvl1 and Warehouse at lvl2.

I have a problem with bought blueprints: Stable (lvl2) and Warehouse (lvl3).

The plans were in Warehous and I've made them as "Use".

I wanted to build warehouse (lvl3) but i have information about error and building weren't made.

After this problem the quantity of this building were 0. 

Every new building bought in shop when it's in Caft have cuantity 0.

I have tried to buy plans again but problem is still the same. I lost coins and don't have buildings.

Please help with this topic.

Thank You

You have to change the number manually. You should be able to click on the 0 and type in a 1 c: